Your permit is good in PA as a state resident, if you relocate to texas, you are no longer a PA state resident and are a Texas resident which makes your PA permit invalid. You have to have a permit IN the state of your resident.
There was just a story on here not too long ago about a guy going to jail for almost the same thing. He had a home in GA I think and was working in Marylard, and was pull over and ended up getting a felony weapons charge. Stupid, but still the law and you do NOT want to mess up on a gun law.
Good luck on the move.