LASORs has no legal status and at times can be wrong. When JAR-FCL was introduced it referred to differences training for: VP Prop, Retractable Undercarriage, Turbo/Super charger; and Pressurisation with Tailwheel being added later.
Both AL5 and AL7 no longer mention any of these differences. The List of aircraft types also disappeared from JAR-FCL and can be found on the JAA website.
The ANO makes no reference to differences training except for SSEA Class ratings on an NPPL. It would appear that there is no legal requirement for these differences which once required a sign off by a FI!
Differences between variants for ME aircraft are covered in JAR-FCL and last for two years.