Hi scoufr,
I'd say that you probably can mix different makers if they have compatible intermediate pressures. If you have not tried yet I'd advise to go to a pool and try there, then go diving with your buddy close to you just in case. I've made quite a few dives with different maker's 1st and 2nd stages. If they are worse than a dedicated. one (only 1 maker) is something I do not really know. We will wait for somebody with more knowledge to enlighten us.
My 2 cents
Paddy
I'd say that you probably can mix different makers if they have compatible intermediate pressures. If you have not tried yet I'd advise to go to a pool and try there, then go diving with your buddy close to you just in case. I've made quite a few dives with different maker's 1st and 2nd stages. If they are worse than a dedicated. one (only 1 maker) is something I do not really know. We will wait for somebody with more knowledge to enlighten us.
My 2 cents
Paddy