Hi there, hoping for some help with cv joints. I'm trying to find the strongest combination as I compete in rallies in the uk

I would like to know if all evo 9 front cv joints are the same or if there are larger oem cv's from different models that are a common upgrade in size/strength?

Also what is the difference between the front and rear cv's? Are the rear cv's bigger internally and can they be fitted on the front?

Thanks