FX Panthera Amp 2 Reg - will it work in an Impact M3?

I know for a fact the impact and crown use same reg. Cant say for sure for the panthera since don't own one. But if you already have both the impact and panthera. And you replaced the panthera with huma reg. That means the panthera reg is sitting there. Why not just put it in the impact? Am I missing something here? 😕
That was my next step after someone confirmed that what I am considering will work. I see that HUMA does list the Panthera and M3 as different regs...but beign there are no part numbers listed - who knows? I don't want to just blindly throw in the AMP 2 account I don't want to damage my M3.