The general rule in reloading shotgun shells is to use the load data EXACTLY as specified: with no changes in hulls, primers, powder, wad, or shot weight. There could be significant differences in volume and wad height, compression, etc if you substitute the hull.
Unlike metallic cartridge ammo, shotgun proof pressures are relatively narrow and close to normal ammo pressures. In other words, there is little margin for overloads.
That said, if you are feeling adventurous, it probably won't hurt to load just a few rounds of shells and substitute your R-P hulls. If your wad column and compression is correct, and the crimps hold, they should be safe to shoot.
John