I think there is some confusion here in the wording.
A "type" conversion is quite different from being checked out out to fly another aircraft within the same "class" of aeroplane. A Jaribu is a simple SEP and is in the same "class" as say a Cessna 150. You do not need to "convert" to fly a Jaribu if you typically fly a C150. It may be sensible or be an insurance requirement to fly so many hours with an instructor or nominated check pilot, but that is not a conversion. If you fly Cessna's or a similar SEP's and want to fly a motorglider for instance, that would be a conversion as the aircraft is a different "type". To further confuse things, "differences" training may be required within an aircraft class, such as tailwheel, and that might very well need formal training.
Simples innit?
SS