Great experiment. You won't be able to tell if they are hybrids any other way than appearance or taste unless you are a molecular chemist. Unfortunately, spaghetti squash , acorn squash, mota, etc. are all hybrids --many modern, most from way back when. Veggies are constantly being cross-bred into new shapes, new colors, new sizes, etc. and given fancy names with a hope that one will be the next best-seller. Please let us know what happens with your experiment and good luck!