Steve,
The numbering code in question doesn't have the feel of a standard product code. As a for instance Kontronik make the Fun400-23, Fun400-28 or Fun400-36. Waht does the second number (23, 28 or 36) refer to? Presumably the '400' code is the equivalent of a brushed 400 motor (come to think of it I'm not sure what the '400' bit means either.