The one in your second picture has Zigbee + US Z-Wave. When used outside of the US, the Z-wave portion of that one is disabled. The one in your first picture is used for Z-Wave specific your country’s laws.
If you don't plan on using one of: Zigbee or ZWave, you can leave it unplugged 'til you do. I know because that's my world I only use ZWave in my house so I use that ZWave stick alone.
I've read that Australia, for example, doesn't have much ZWave availability. So they could get by with only the Zigbee (the Nortek one) installed. There's a Disable for each protocol in the Hub too. Settings, then either/both ZWave Info/Zigbee Info.