....I've always taken the name difference to indicate the product's similarity to either frosting (Frostin' Pride) or pastry cream (Pastry Pride). I'd expect a frosting to be denser and to hold color and shape well......
Years ago I talked w/the company and they were very upset to hear of the many, many who were using Pastry Pride to ice cakes

The explained how much different the two products were. FP takes color much better; holds it shape when piped much better, etc. In other words it was designed to be a denser product for that use.