There are 2 models, one for vegeta before 2mil pl and one for vegeta after 2mil pl. You can put whatever moddel you like for those, even a piccolo model. But, since in ESF there is only one transformation, you can only have 2 models of each character at any time. If you want them to be an ssj2 and ssj4 model its up to you. But only 2 models.