I have no idea if the Propel and Sonus pads are the *same* but they look very close to each other.
These pads are made by Propel because the Sonus DAS pads don't come in yellow or grey (not anymore anyway), only blue, green, and orange.
The Propel pad order is as follows:
Grey - Level 0
Blue - Level 1
Green - Level 2
Yellow - Level 3
Orange - Level 4 (most aggressive)
As far as the color differential, most are different so be careful. In this case, they are actually the same but only in this case.
LC DA pads come in grey, white, and orange (correct order of aggressiveness by the way).