You can almost always go up one size without problem.
The Sparkie molds use the EC 410/413 hooks. You should have no problem using EC 730 hooks.
I can tell you that if you want to go a lot larger you're going to have problems with the alignment of the hook. The length of the eye will cause the rest of the hook to sit at a angle.
This Veteran heavily medicated for your safety. Keep me fishing and all will be well.