Anything that would speak against the 215 style replica from eurotech, in size 21?

the size is slightly different from the original 10.5 x 11.5 instead of 10 x 11.5. Would I require different sized tyres for the replica compared to the original size?

Would I still only be able to use Dunlop SP Sport Maxx or is there any other choice?

I live in a country with lot of potholes and uneven road surface. Any difference to use replica compared to original?