The change of Tpx to Tipx was a legal one regarding the name
So no change to specs.
But original Tpxs had a free service pack which did things such as a different puncture pin as there were problems with certain 12 grams, and changing the magazine from 8 to 7 as some paint didn't like it
You may have a later tpx, or a serviced tpx in which case you are the same as the tipx
If you have any of the problems then Tippmann techs/BZ in the UK will sort it