Pure pumpkin is usually how canned pumpkin is labeled. This is different from pumpkin pie filling. The distinction is that pure pumpkin is just pumpkin, hence the name, whereas pumpkin pie filling is pumpkin with pumpkin pie spices. Pumpkin puree is most often fresh pumpkin that has been pureed. Canned pumpkin and pureed pumpkin can be used interchangeably, but pumpkin pie filling can not be substituted.