Apparently, I noticed the inlay size difference. Ken Nestle pointed out the E. And David Spragg confirmed the differences, but concluded they did not vary enough to warrant a separate catalog number:

http://www.thechipboard.com/archives/archives.pl/bid/314/page/1/md/read/id/501446/sbj/is-a-difference-in-inlay-size-normal/

Michael Siskin