Blimey, so not an expert on all things Italian or flying/licensing regulations.....
Any difference training like that would be a local rule (club for instance) to fly a C172 from a C150 - not a legal requirement for a PPL holder in the UK.
Helicopters, I believe do have 5 hours (?) type rating training between types. Not on fixed wing though, apart for glass cockpit, tailwheel, retracts, CS prop etc.
Bizarre.
PS There's no 'h' in Tecnam.