Yes that is right, the branch name is supposed to only contain the part that changes in each branch.

Look at it this way: if you want to use one of youre pois you place each tag into a senctence for example:
(shop=storage_rental) You know it is a place to rent storage.
(name=BOXIE24) you know the name of the place.
(branch=Zwolle) Oh it is the BOXIE24 Zwolle
(Brand=BOXIE24) It is a brand with multable branches

Of you copy theese things into other tags you will get duplicates like: "BOXIE24 Zwolle Zwolle" or
"BOXIE24 Zwolle BOXIE24" etc.

That is why it is important to not add unessesery stuff at the end of tags

