Formula question

Kaye • Baby Robert Todd was born Oct. 28th, 2019!

I use Enfamil Neuropro Infant. I have a few cans of Enfamil Neuropro Gentlease that I received in sample boxes and from my doctors office. My son does great on the regular Neuropro. I don't want to switch, but I also don't want the Gentlease cans I have to go to waste. Is it safe to use two different formulas or will that upset his stomach?