i have both mavic 3 and mavic 3 cine, is possible to pair the RC Pro (which include with mavic 3 cine) also to mavic 3 without unpairing mavic 3 cine (so to use the  RC Pro for both of them) ??????

As there is no aircraft management in RC PRO I highly doubt it will be possible without unpairing, I think currently it behaves like normal RC so could be paired only to one aircraft. However I do not have two M3 so cannot test it.