2007 Ultra Hobby/Retail?

[sportster2827]

Can anyone tell me the difference in the Hobby and the Retail of this product? I have some of both and can't tell which is which? Here is an example.

[ohiomike]

If its the set I'm thinking of, the foil on the front of the card will either be holo-silver (hobby) or flat-silver (retail). So if the foil is shiny it should be hobby and if it is dull non-shiny foil it should be retail.