If they were done in an approved school / club for the PPL yes they will count however you'll need to try and get them into your logbook. There should also be a training record of some description from your previous hours. If you can get hold of that as well that will help with having the hours recognised. Obviously, you'll need a recap on the lessons, especially if it's at a new airfield or on a new aircraft type. It's not the end of the world if you can't find the original records, the average PPL takes between 55-60 hours so you'll probably make up the hours anyway.