I have a pawn I want to possess, but the thing is that … I want to control also the first pawn, is that possible ?

what do you mean by control the first pawn as well? do you mean such as in the case of entering a vehicle and you want your player model to tag along or as in posses another character but both keep moving as if in sync?

Controlling both of them together.
One is controled by keyboard and the other one by the mouse controls.

There is a video on utube. It shows how you can control one pawn with left stick and another with right stick at the same time. Look for possesing two pawns or something like that.

Can’t find it, any chance to get a link ?

Here you go.