Jerry should know. I think they are synonymous. With Latin names, only one can be right at any given time, so it is probably F. Microcarpa now. This site shows other synonyms and common names:
http://davesgarden.com/pf/go/57818/
It's not unsual for the "incorrect" name to be more common! (It doesn't make it right but it does sometimes get you what you want at the nursery)
Hey, here is something interesting. Have you ever seen something like this?
Quote:
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DO NOT LINK TO THIS PAGE - LAWFUL FOR ACCESS ONLY BY CURRENT SOCIETY MEMBERS
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Oh well. I will link to a Google's
cache of that page and remain lawful

. You can decide whether or not to visit yourself!
http://66.102.7.104/search?q=cache:...888.html+&hl=en
Regards,
Matt