No. Impact and wildcat barrels are different, and gen 1 wildcat did not have the liner system.
Actually this is not correct, certainly not for the last two generations. The barrels in the Wildcat and Impact (MK 2 and M3) are identical. What is different is the shroud. I have often swapped Wildcat and Impact barrels (for example, where I have a .22 Wildcat barrel but not a .25, or where I have a 500mm for one but not for the other) by simply switching the shrouds. In fact, I recently purchased 500mm and 600mm shrouds from FX USA for my Impacts so that I could make use of my Wildcat and Dreamline barrels in different calibers and lengths. And yes, Dreamline (Not the SuperLight barrels) will also interchange.
Chris