[coolhandkuhn]

b/c a turn and a river of 10 & 7 in the first example give a split pot, where the same turn & river of 10 & 7 in the second example gives the pot to K-8.
I can't show you the math like brucez or some others can --- but in the first example the only winners for K-8 are two running Kings (3/45 * 2/44) or two running eights (2/45 * 1/45).
In the second example, K-8 wins with a running 10-7 or 7-10 (8/45 * 4/44). You have to discount for the times that both 10-7 show up as hearts, giving a flush to the JJ hand, but you get the point. I think I have that right, but if not, I'm sure someone will let me know.