Unless I'm missing something, Jegs and Summit usually have the same parts and similar prices. Comparing "apples to apples", Summit is .04 cheaper tha Jeg's on KS2110!
I missed that one on Summit, the one I found has all of the same gaskets, plus the intake manifold gaskets w/o the pan.
I don't think they are for the same engines, even though they share 383 and 413: 361, 383, 400, 413, 426, 440, vs 350, 361, 383, 413.