Talk about engineering or not?

A lot of schools and ivies require a supplement where you have to expand on your major and how you got interested in it or experiences you have in it. So here I can talk about my major which is engineering. Should I talk about my major in the common app essay? Or should I make my application more well rounded and have the common app essay be more general since the supplements will cover my passion in my major?

I am debating my common app essay because a lot of colleges don’t have STEM specific supplements or don’t provide enough to expand on my interest and passion for engineering so for these colleges I would like to center my common app on engineering. But other colleges give you another whole 650 words to expand on your major or anything else so for these colleges I would like to have the common app essay be different. Or would it be ok to still have the common app be engineering/sciency for these colleges?