It should be fine if you're just out and about for not too long, powder does play a part in keeping things comfortable.
I always try to have and use powder but in a pinch you'll be fine with just cream.
Powder just keeps things a little cooler/dryer down there for a little while, keeps the creams from fouling the standing leak guard elastics(M4 issue), keeps the diaper from sticking to your butt/bits and reduces chafing around and legs(and bum if you shave).
And if you don't want to bring a large bottle of powder, they have smaller almost travel sized ones available. Just a quick puff down the front and back once changed into the diaper is how I've done powder in a pinch
Good luck, stay clean, be courteous about it and have fun in your 24/7 adventures [emoji106]