Jeffery,
Essentially you are correct. It was designed from the Sky riser but there were alterations made other than just the limb pads. They are not Sky limb pads. New limb pads had to be designed for the riser and the pads cannot be switched to convert the riser to ILF. There are some differences there in the risers so it won't work. In that respect there are two different risers, but is essence they shoot the same because grip and the essentials of the risers didn't change.
Limbs are also made by Sky to DAS specifications. Jim makes a heck of a limb that is hard to beat.