Will these Tyre sizes work for 18" MV3

Hi guys, i have come across a set of pirelli p zeros with 5mm tread all round in the following sizes:



Tyres 225/45/18 and 255/40/18



Obviously they are right width but wall sizes are one up



Will they work or will they cause issues? Only thing i can think is the rims will look a bit smaller?



Any help appreciated