Yes , the CIP is longer. Look on the bottom or back of the mag and it will tell you. If it is CIP, it will be on there. If it doesn't say CIP, it's not. Regardless of that, the front ribs have to be milled off of both sides. I will see if I can get a pic of mine today when I get up.
If that picture is the one from Mile High, it is not a CIP mag length. It is a damn good buy though. You don't see them come up in the ee for that price, ever.