The Supreme Court isn't going to hear Texas's suit. They've already strongly signaled that by rejecting the Pennsylvania suit without any dissents; Texas is basically trying to sue Pennsylvania for the same things, again.
No I believe it is true that a plaintiff from Pennsylvania who was suing Pennsylvania was denied in the SCOTUS, but this was after Texas files their suit which was more inclusive, so the two might relate.
Edit:
SCOTUS declined to hear that case, possibly in anticipation of hearing the Texas one instead, possibly because they intend to hear neither.