Can I return tickets and get a full credit. If not can they be exchanged for another show

Yes provided the show has that option. Some shows dont allow a refund and other shows have a deadline date

I agree with the last answer. Call the theater.

I would contact the theater. There are too many variables.

usually you can exchange it for the same show to another date.

I believe it also is dependent upon the performers and their return ticket policy.

You probably need to contact the theater box office directly.