As I understand, training hours are not directly transferable from LAPL to EASA PPL.
Even though you would use the same instructor and the same aircraft from the same airfield!
So the advice is - until you need the medical - to start out saying you want the EASA PPL. Then - perhaps you can only get a LAPL medical - those PPL hours will count for the LAPL.
The other way round, I don't think they do.
Of course, once you have a LAPL, there is a conversion course to a ESA SEP PPL.