The way Yamaha usually numbered things , the first series were just the model, aka ,TT or XT , or XJ ect.. The middle series(second and third set) is the actual part number , fourth is like an option or revision of the part. It usually comes out pretty reliable this way , but not foolproof. Newer parts I can't say if they follow that but these older one do . I would say that those are the same part.
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