u/Redg5588

I have a 2022 Rocky Mountain altitude C 70. Currently I have 180mm Fox38 that only fit a 27.5, I want to make it a mx/mullet. Fox obviously makes a fork that fits 29s and a fork that fits just 27.5. But they also make a fork that fits 27.5 and 29. Since I want to run the 29 what’s the difference here between the fork thats made for a 29 or the fork thats made to offer both 27.5/29 Im guessing there’s still plenty of arch room on the 27.5/29 to offer the 29 safely so what is different and what should I be going with here? Thanks