The minor trim differences are really weird. When a special edition is produced you'd think they basic spec would be identical.
Indeed, you'd think they'd all have the red trim on the belts and the red cap trim.
It must be logistically more difficult for VW to build them with all sorts of trim variations than if they'd all come with the same trim specs (ignoring options of course).
You could always retrofit the red centre caps (I think someone here did that?) but in VW style they're not cheap and in my humble opinion, they're naff.
They suit the other red accents on the GTI but would probably look a bit out of place on other models in the range unless you'd been to badge skins and raided their catalogue for red detailing. Those that have GTD's and have added a few red details to their cars have made them look a bit less monochrome.