Change unit model with trigger

[MooNek]

Hello, I would like to ask is there way to change unit's model useing a trigger?
ex. I would like to change unit's look from Illidan (DH) to Evil Illidan with some system, but it has to be still same unit.
Thanks for every help, if something like this isn't possible just say it please

 

[Strydhaizer]

As i know, the REPLACE UNIT trigger answers this question

 

[GreeN!X]

You can just use metamorphosis and use two same units but with different models..

EDIT: or what Stryderzero said..

 

[MooNek]

As i know, the REPLACE UNIT trigger answers this question

Thanks very much, forgotten about this one .
Thakns both of you for quick help.