Why is the color temperature information of the matter device not reflected properly?
Data from the same instrument in HE and ST.
Device is the Zemismart LED Streep Controller
Looks about correct to me. 
The "native" unit for color temperature in Matter is mireks or mireds, not Kelvin, and the difference between the two is probably just one platform rounding up after the conversion while the other is rounding down. Are you experiencing any problems or just curious about the difference?
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I'm using two elements related to the color of the matter device supported by HE and ST at the same time + virtual device + rule (scenario) to seamlessly link to different situations on two platforms.
Using one element causes problems.
Of course, I can avoid that by using delay execution, but I want real-time synchronization.
In this situation, the value of $10 led strip controller becomes very large.
for example
I'm not sure what your second set of screenshots is supposed to show. Are you also experiencing discrepancy with level reporting? Matter natively uses 255 as the maximum level, whereas Hubitat uses 100, so there could again be differences in rounding between the two platforms.
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I only used 1 element in HE because the 2 elements I use in ST don't apply in HE.
The rules used above are for controlling virtual switches
Do you have any recommendations for common 2 elements?
I'm not sure what you mean with "elements." Are you talking about attributes on the device, like level or color temperature? If so, wouldn't it work if you just put a bit more space between the values you're comparing, like looking things like a single Kelvin of difference, which might be subject to rounding errors? But I don't know what you're actually trying to do (perhaps because I can't read Korean but also because I don't know what the underlying goal is).
I also won't be much help with SmartThings, as I haven't used it since I switched to Hubitat in 2018. 
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Thank you for your kind reply.
- colorTemperature : 4000
- hue : 4
- level : 6
- saturation : 7
- switch : on
OK, yes, those are what I meant with "attributes."
However, I'm still not sure what you are doing. If it's helpful, I see where the Generic Matter RGBW Light driver is actually truncating the color temperature value instead of rounding (in your first post, it was probably 454 mireds, then 1000000/454 ≈ 2202.643, resulting in the above differences of 2202 and 2203). That will probably be changed in release 2.4.0. Level is already rounded this way, so that shouldn't be a problem.
But I'm not sure about what you're actually doing (e.g., if it's a Matter device, you shouldn't need any workaround to share it between the two platforms; if you're using it as a "trigger" for some automation -- perhaps including a change on one platform you're looking for on the other -- and are depending on a specific value, maybe, but without more information, it's hard to say what might help beyond my general ideas above).
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