As far as I know, all 3 wheelers have three numbers:

1 - chassis number, stamped in the chassis by its manufacturer (Premier Group - Coventry)

2 - ash frame number, stamped by MMC

3 - VIN number, stamped in the stainless steel ID plate / given by MMC.

So it's normal to have three different numbers at sight, but for legal purposes the VIN is the winner.

Regards

Javier - Madrid, Spain - Commander of Speedy Marmots Bomb Squadron
www.speedymarmots.com