Hi and welcome. I’m of the opinion that Makita and Hitachi are made in the same factory. I think the parent company might be Rexon. I have that router also and it looked very much like an older Makita and appears to share the same collet. That collet is a bit of an oddity in design so it would be an odd coincidence if they weren’t the same. I also have a Makita 1900B 3 1/8” power plane and Hitachi sold an identical machine that even used the same model number. The only difference was the colour of the plastic body. So I think there is an excellent chance the bases interchange.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.