Unless you are showing in a non-breed sport and they are under 14.2 (or whatever the FEI pony cutoff is, which I think is slightly different). Your 14.1 Morgan/Arab is going to be a large pony hunter no matter what the breed people call him, not a small junior.
And your 15 hh Connemara can enjoy being a small junior or a children's hunter, but he can't be a large pony.
Just for added confusion