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As an old mechanic for a Gail dealer, I can tell you that if the part is the same, the part number is the same between Gale, Johnson, and Evinrude. I can also tell you that with the exception of the cowl (shape), darn near everything on the 40 Gale was used on J/E at one time or another. I can also tell you that I personally owned a 40 Gale and ran it for a number of years. A very satisfactory motor.
If you do buy one, do yourself a big favor and get a parts list specific to your particular model. Parts are available at any Evinrude dealer (inasmuch as J/E parts are). But they won't give you the time of day unless you go in armed with part numbers. That's partly because they don't have the book either.