I've had more than one, that way, tho I'd have to calculate to see if the size differences are the same - actually I don't - you have a much larger size difference!
The largest mare that ended up in foal to a 45" stallion was 13.3hh and WIDE (later we covered her with supervised covers from a ramp and it was amazing how he could "hug" her with his forelegs - 5 fabulous foals from that cross!!) and another mare was 13.1 and stallion was petite 40". Previously she'd produced foals from that cross from a ramp as well and we thought since he was a very shy breeder that we'd be OK turning them out together, LOL. That was a really nice cross as well. I have her 2nd daughter still and looking to breed her to the son of the first stallion - probably next year... Won't be a registerable foal with ASPC, but would be a pinto.
Congrats! We get to see a 1/2 welsh, appy baby that should be a wonderful sport type pony!! NOW THAT is EXCITING!!