Modding

I’m sure this has been asked many times, but I couldn’t find anything using the search function.
Basically, I need help. How do I assign the attack animation of one creature to another?
Specifically, I need to change the attack animation of the Necromancer dragon (first upgrade, I don’t remember what it’s called in Russian) and give it the attack animation of the Elven dragon (also the first upgrade).

Animations don’t always work well with the models of other creatures; in this case, the Necromancer dragon will be distorted on the screen as if it were hit by a combine (most likely).
And here’s my question: some animations affect the scale of the model. Can this be fixed? (I encountered this problem during an experiment: the Cyclops animation works for the Minotaur, and it looks good, but the Minotaur shrinks to the size of a Goblin).