I believe if you have hours with one provider and start the same course with another then it’s possible those trial lessons won’t count, I think it depends what the school accepts (I can’t remember the specifics). If the course is with the same provider it will still count, my trial lessons were done as if I was doing a full PPL course. It all adds up, and you’re one hour closer to the 45 you need! One or two hours doesn’t make much difference in the grand scheme of the 150-200hrs you eventually end up with.
You’re a couple of years away from qualifying, a lot will happen before then. I wouldn’t plan on pinning everything on getting a job straight out of school. From my own journey I’ve noticed that it’s as much about the training as it is the future and financial planning of the whole process!