I think it is because it is them in a different part of their lives, for instance EX:Primrose is a higher level which seems to suggest that she has gained power since her first incarnation appeared. Could also be going for a slightly alternate reality version of the character, like how gambit in X-men is pretty strong but in an alternate universe he supercharged the matter of an entire planet to destroy it. I would like to see a gm response to how having EX and normal out in play works flavor wise though.
Moon child pops oh look at my s-p
Thanks to bernet this combo's cra-zy
Lovin dragon emp's mainly the zombie
Dodge assain so they curse furiously.