gallicaX HP

A neighbor has a large Tuscany Superb. I got a bloom from him and used the pollen to fertilize a Ferdinand Pitchard. Do Gallicas and HPs redily cross?

Hybrid Pertuals have chromosome count of 21 and 28. Ferdinand is a tetraploid in my belief, as Ralph Moore used in his breeding program to get the stripe roses.

A Tuscany Superb x Ferdinand Pitchard (or vise versa) should cross pretty easily.