You can use the CODE function to get the ASCII value of the right
character, such as:

=CODE(RIGHT(B1,1))-CODE(RIGHT(A1,1))=1

There are a couple of warnings with this, though. First, it will throw
an error if either cell is empty. Second, it give a false positive if
the first character is different for the two values, e.g., EA and FB.
However, you could build on the above statement to make a complex
statement with nested If()'s.

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Nick Hebb
BreezeTree Software
http://www.breezetree.com