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None of the NAMC’s “Catalog of all Series Matchbox Models” (second edition), the AIM's “1-75 Series Regular Wheels” catalogue (second printing, 1983), Stannard, Houghton, or Leake ("Concise Catalogue of 75 Series Matchbox Toys by Lesney" (4th edition, reprinted 2006)) lists any variation not already catalogued by Nick.
U.K. Matchbox examined the model briefly in Vol. 3 no. 4 (Jun. '79) p66 but did not identify any new variations.

A summary with some unlisted variations:
a) light green
b) green
c) dark green

There are listed three wheel variations. I think there are four variations:
a) 7mm, short hubs, small braces
b) 7mm, long hubs, small braces
c) 7mm, short hubs, large braces
d) 6mm, short hubs, large braces
I am not sure about the order, if the second variation was b) or c). What do you think?
Antonin