Why on earth would a pilot of your experience want to fly something so deeply uninspiring as a C152? Safe admittedly - but cramped, ugly, slow and expensive to run.
Anyhow, answering the question - I'd not expect pilots logbook and aircraft tech-log entries to necessarily line up, and potentially for quite legitimate reasons. If the tech log is worked against tacho, but the pilots logbook against the clock for example. On the other hand time ground-running should be logged in the engine logbook, but not in the pilot's.
A flying hours summary is sent every 3 years to the CAA with the CofA renewal paperwork. If you go to G-INFO and enter the registration of the aircraft of interest, it'll show the most recently recorded hours.
G