Can I be issued a ticket in nys. For an expired pa inscpection?

Yes. If your car is registered in PA and you drive in NY they can indeed cite you for an expired PA inspection sticker - just as they can cite you if your PA driver's license was expired.

Most states now have DMV reciprocity. And they don't have to be near each other either. You can move cross country and be unable to register a car until you pay all your old tickets and fees.