Can you use a RA2 Select repeater with a RadioRa2 System?

I was just wondering if it is possible to use a RA2 Select Repeater instead of the RadioRa2 repeater.

I'm guessing it should be possible, given that as I understand it, the protocols are same because both systems uses the same switch hardware, but I just wanted to confirm

No. R2S main repeater is designed to be programmed via the Connect app. The RR2 main repeater is designed to be programmed via the RR2 software.

You can use the R2S aux repeater in a RR2 system.