I'd advise against this. First of all, did you even ask your members if they wanted this to happen? And do your members have experience with past merges? Don't want people blindly agreeing with this thinking it's a good idea like I did with my old FC. Second, do not give leadership to another FC's members. Not saying every person is like this, but do not give them any opportunity to buddy up to you just for power. If you have to leave for a long period of time and they're now in charge, your current members may or may not like what this other person has planned.

I was in a position where I was asked if I wanted to merge with another FC since this other group split up for some reason. Of course I agreed to it thinking it was a good idea since we did so much content with this other group. Was going well until our FC leader stopped playing for RL reasons (which is perfectly fine) and passed lead to one of the new people. Things changed and a lot of the original FC members left. I myself left after some time and now that FC is dead to me.

Anyway, I didn't mean to go on some long rant and tell you my story. I just want the best for your FC and don't want it to end up like my old one. Please think things over very carefully for yourself and your members.