The first new build batch of A4Gs did not have white rudders in original paint scheme. It gets complicated and I hope you will find explanation in the 1GB PDF (I don't have a ready example to give you relevant page numbers). However a cheap and nasty short explanation would be that only gradually may have the rudders been painted white (on any side number 88x).
However any second hand batch later A4Gs (side number 87x) all had shiny paint jobs with white rudders and ailerons because that had become standard USN. Keep in mind the original dull paint scheme was not hard wearing so many experiments on individual aircraft were carried out to ameliorate the effect of paint stripping off; amongst other problems with this dull paint. The original dull paint was also much more expensive and very difficult to supply so the original paint scheme gradually changed to the high gloss scheme via a semi gloss in some cases.
And the differences don't end there. The originals did not have the black nose top in front of the windscreen. However the TA4Gs did. Then all the second hand batch had this black panel so gradually the originals took on this panel also.
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