Pumpkin Pie and Sweet Potato Pie are made in similar ways and look similar, but there are some key differences: 1. Sweet Potato Pie is generally more popular for Thanksgiving in the South of the United States, whilst Pumpkin Pieis more popular in the North. 2. The main difference in taste is that Pumpkin Pie is nuttier whereas Sweet Potato Pie has a more mellow flavour. 3. The main difference in texture is that sweet potato is naturally starchier than pumpkin, so Sweet Potato Pie filling has a denser texture than Pumpkin Pie.