Like Peter said, both of these are milk snakes.
But to answer your questions....
Scarlet Kingsnakes and Eastern Milk Snakes do intergrade in certain areas on the east coast. I am assuming you think that these two, create the extremely nice looking, Coastal Plains Milk Snake(L.t.temporalis)? They don't. Crossing a scarlet king and a eastern milk actually creates a pretty crappy looking snake. There are a few biologists out there working on proving that temporalis is their own sub-species.
There are a couple professionals out there working with coastal plains milk snakes, PWeaver is one of those, you can find him in the milk snake forum, his specimens are outstanding.
Mike
Michael's Place
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KingPin Reptiles Inc.
Helmz777@aol.com
www.freewebs.com/mikesnake