Horse skin by condition

[Vassy 2]

Hi guys. I want the horse to have a different model 3D by some condition like

 

if (beta_tester == 1) {

show_skinned_horse;

} else {

show_normal_horse;

}

 

I want the skinned horse to act exactly like normal horse, to be leveled up and so on.

 

Someone have any idee how to do this? I use source, ofc.

 

Thanks.