Visa, if you get all season tyres then you won't have an issue. Not sure what size tyres you get with the 63 but there are NO authorised 19 or 20 inch all weather tyres available for the 43 in the UK, hence they gave me a set of AMG 20 inch multi spoke wheels with winter tyres even though my car is fitted with 19 inch night pack wheels.
2017 GLC AMG43 premium plus, night pack, leather, intel lights, 360 camera, side steps. = sadly gone
Now GLE450 Premium plus, Selenite, Black/White Nappa leather, Tech plus pack, Driving assistance pack, Tow pack, Off road pack, 22 inch wheels.