Yep, C10 and K10 rear ends are identical with exception C10 axles are drilled for 5 lug wheels, K10 is axles are drilled for 6 lug wheels. So if you found a 2wd drive rear end in the ratio you need to match the front, then you could swap your 6 lug axles from the K10 into the C10 rear end and be good to go. If it's a 10 bolt rear end though, be sure to know what year rear end or axles you're dealing with. The early 10 bolts used 28 spline axles and the later ones used 30 spline axles. But, if you have 28 spline axles in your rear end but found 30 spline rear end and needed to swap to the 6 lug axles, simply remove and swap your spider gears also and you're good to go.