one unit model, other unit model birth

[Herod]

I am trying building my own w3 after the distaster of w3 reforged. I´ve finded a remastered mod: rebirth, idk if is legal but im enjoiyng. But like none of this world is perfect, some issues of the new mod I wanna change. For exemple. The skeleton warrior, there´s a way to keep the new skin but change how he birth or death animation to the original one?