Do vehicle registration/license plate numbers change, for any reason?

If you want to register it somewhere else, other province.

So its normal to have some older receipts and copies from log book with a different registration number?

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With log book you mean the blue book? It has all the details. It's not normal to have a different number than in there.

You get a new book or the book changed, if the registration changes. Incl. number plates.

So to say it simple, if the plates do not match the book, they do not belong together.

The plates match the new blue book. The chassis number matches the blue book.

But all the service receipts and copies of a previos blue book showing first change of ownership have different reg number on them, but same chassis number

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Looks ok to me. Owner moved or changed. Or maybe the dealer in the first place.

Probably re registered it in a different province same with mine blue book now in my name with different plate numbers on page but back owners with different plates

Madman you don't get a new blue book if plates change mate