Agree. The two products you list are not interchangeable.
Athena only makes one basic prep product and that is phyllo dough. There is no butter in this product because the baker usually adds it per the recipe to coat many many thin layers. However, the product will not "puff" and rise like puff pastry does:
INGREDIENTS:
Enriched Wheat Flour (wheat flour, niacin, iron, thiamin mononitrate, riboflavin, folic acid), Water, Corn Starch, Dextrose, Maltodextrin, Salt, Canola Oil, Preservatives (calcium propionate, sodium propionate, potassium sorbate).
Pepperidge Farm Puff Pastry Dough also has NO butter, but does have a load of other stuff to mimic the effect (see link). It will puff and rise under heat.
If your recipe requires puff pastry and there's a Whole Foods nearby, try Dufour Puff Pastry. This product works beautifully and its ingredient list is much shorter: butter, flour, water, salt, lemon juice.
https://www.amazon.com/Pepperidge-Farm-Pastry-Sheets-Frozen/dp/B000Q7KAYI