The footwell shape is the same but the mounting clicks on the drivers side mat are a different shape on early mk5s not sure about the larer mk5s if there the same as the 6s or not.
^ Heres a photo of my mk6 front matt. Not really the best picture but as you can see it has the round click in fasteners. IIRC on the packing it did say MK5 & 6.