1. The brand of puff pastry I love using for this is called White Toque; mainly because it's an all-butter puff pastry AND the sheets are already round and ready to go!
2. You may be using a different brand of round puffy pastry that might not measure 12-inches like mine. Use your best judgement in terms of adding the pumpkin puree. It might be too much if your puff pastry rounds are smaller, resulting in a super messy assembly. The layer of pumpkin puree should be on the thinner side so puree doesn't ooze out of the sides.