RE: Two box calls
Absolutely, anytime you can break it up or change calls is at times all it takes. Not all birds respond the same to the same calls or from different calls for that matters. When you have a tom interested, at times changing calls is all it takes to lure them in.
Don't forget too that changed the type of call will at times be the answer, go from a box to a pot or mouth or vise versa etc....