new os install

Hello, I've finally decided to pull the trigger on a new gaming rig build to replace my +8 y.o. Frankenstein tower - and I'm trying to build it around a new RTX 3080 (...for when I can actually get my hands on one). I actually pulled the trigger on a few components that have come up on sale...

I'm thinking of changing out my MSI B450 pro carbon regular to the Max variant, would I need a new fresh OS install? I read people said you need to have a fresh install when changing motherboards. Have anyone switch their regular B450 to the Max version of the same model?