What Car? says...
It’s not uncommon in the tech world to add a '.1' to the end of something to declare an update to an existing version, but in the van world, it’s never been a thing. The Volkswagen Transporter T6.1 changed that.
The ‘.1’ was added to the Transporter T6 name when the model was facelifted. On the styling front, that means the current Transporter T6.1 has a different front grille and bumper to the previous T6, and narrower headlights that merge distinctively with the crossbar running through the front grille.