Depends a lot on the recipe.

Most of the time the outcome will be different. Not better or worse, you understand, just a different texture and possibly a different flavor profile.

Give it a whirl and see what happens. Whatever the outcome it will still be edible, so you won't be wasting it.

True Enough, Thankyou So Much For Your Info. On All My Many Questions I Have Posted.

As one who has accidentally bought phyllo instead of puff pastry, I can say that they are really two different things. I wish that they didn't package them in the same color, shape, etc., boxes. I make it a point to triple check the box when I buy puff pastry.