According to another question here: https://boardgames.stackexchange.com/a/28550 you may not do this. However on the official magic site it states you may do it. https://magic.wizards.com/en/articles/archive/how-build/how-build-dinosaurs-2017-09-29 Section
Build To Fight
Rile replaces itself, gives a creature trample, and is cheap to cast, while Dual Shot and Slash of Talons present versatile options that can be used against enemy creatures as well as your own.