No you should not need to do this. You may just need to refresh it on Google home and log in again. I have mine only setup for testing with a couple devices but it carried over. Same with Alexa, came right over smoothly.
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Are you using the community Google Home app or the built-in Google Home app?.... or does it make a difference? I am presently using the built-in Google Home app.
Both, the community app requires some extra steps. I believe the built in one carried over easily, possibly had to log in on the Google Home app again.
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That’s not very well hidden from your wife, who will realize that you bought yet another hub.
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After migration to the C8 I reenabled the Google Home app on Hubitat, I noticed on frequent repeating error in Hub logs for the Home app. Went to my phone, opened the Android Home app. Trying to update the existing connection to Hubitat didn't work. So I chose Unlink to remove the Hubitat connection and devices then I reconnected just like initial setup. All my devices were back in Home and working right away.
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I'm using the community Google Home integration, and all I had to do was replace the hub UID in the Google Home setup...I posted the info here:
Aside from that I went into the Google Home app, Settings>Works w/Google, tapped the integration and chose the Re-connect Account option, and chose my new hub. That was all it took for me.
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She's working in her office, and has walked by it (3' away) several times now.
C-8: "Look at me, I'm hiding in plain sight!!" 
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In the documentation I believe it refers to this as a “1% problem.”
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Nice! Now I know I do not even need to redesign that one, just add some labeling into it for C-8 also.
I did not even get a chance to start checking with my own yet.
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Fits perfectly w/the C-8, zero issues. The open yet secure design is a winner!
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I have my hubs mounted on a laptop cooling pad with two fans using Command strips, and that pad is itself mounted to the wall. They rarely get over 103. the C4 used to get up into the 130's. That's why it was retired.
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c8 would not mount that way as they recommend anntenas go up or down and they dont bend.
Did notice the new c8 seems to run about 10 degrees hotter than the old c7.
thanks for making me look.
since mine is on a flat glass shelf thiniking of trying one of the xbox usb cooling pads as i dont have room for a bigger laptop one.. Will see if it is too noisy.
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If you can get power to it, maybe a small Noctua fan velco'd to the glass next to the hub? 
Or you could go w/@lewis.heidrick's custom cooling case w/external antenna support. Though it doesn't appear to support the location of the C-8 antennas. Maybe he'll update it at some point?
https://www.printables.com/model/180863-hubitat-c7-custom-case
https://www.printables.com/model/284424-hubitat-custom-case-wall-mount
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Thats what i thought as well, but @danabw posted above that it is possible. I plan to play with it this afternoon.
Or if you just want to leave it on the shelf, you could put one on those cooling pad under it and leave it right side up,
Now that mine is all settled in its actually running cooler than the C7. On the C7 I had little felt pads on the bottom to give it more air flow underneath and I have not even done that on the C8 yet, its still in a factory setup. Right now its at 102F, earlier this morning it was actually below 100F which I have never seen before.
Mine during beta was constantly at 120-120f but has been holding at 114f since .101
Mine was running in the 90s when idle. C8 has not gone below 104
Smaller the fan usually the nosier they are as they have to spin faster to generate the same airflow as a larger one. I have one of these ordered to try.
As i said a laptop cooling pad would be too big for my location.
https://www.amazon.com/gp/product/B0B9G6LWM1/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
Now that's a fan!! Love it.
My C-8 is definitely running warmer then the C7. Only difference is the C7 was flat next to the wall while the C8 is about 2.5 feet higher on the wall and mounted against it. Not sure how much of a difference that would make.
That said the increase is what maybe 10-15 degrees. It is pretty obvious on the graph. The interesting thing is you can also see my dev hub which ran warmer than my prod hub. They are pretty close so I am not sure this is any different then may be just a manufacturing variant
Even with it being higher it hardly goes above 100 degrees so all is good.
