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As far as I'm aware the cases were the same. The 700r4/4L60 was basically the same as the 4L60E but with out the electronics. A call to someone like Advanced Adapters should give you an idea.
I think SouthernSpeed is correct. I also remember reading the 700 / 208 adapter is the same as the 350 / 203 but there are 2 versions of the 350 / 203 and it's the taller or hi version that is the same as the 700 / 208.