What's the difference between:

Lambretta ( http://imcdb.org/vehicles_make-Lambretta.html ) and Innocenti Lambretta ( http://imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Innocenti&model=La- mbretta )

Motobécane AV something ( http://imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Motob%E9cane&model=- AV&modelMatch=1&modelInclModel=on ) and Motobécane Mobylette AV something ( http://imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Motob%E9cane&model=- Mobylette&modelMatch=1&modelInclModel=on )

Mobilette Motobecane ( http://imcdb.org/vehicles_make-Mobilette+Motobecane.html ) and Mobylette ( http://imcdb.org/vehicles_make-Mobylette.html )

?

Last one sounds like an error
I'm renaming the four listed that way:
http://imcdb.org/vehicle_200987-Mobilette-Motobecane-89.html
http://imcdb.org/vehicle_200458-Mobilette-Motobecane-AV-70.html
http://imcdb.org/vehicle_408752-Mobilette-Motobecane-Cady.html
http://imcdb.org/vehicle_711696-Mobilette-Motobecane-Cady.html

I suppose the other ones are a similar naming error