Just an FYI - the amazon listing for the guide pro pants is actually two separate products: the guide pro and the Rainier, a cheaper pant with a very 'relaxed' fit. The colors with a 'Rainier' prefix distinguish the two.
There's probably a 2" difference in waist size on the same numeric size, and the quality is lower. Don't think you're getting a good deal - you're just buying a different pair of pants.