Was reading my copy of Barry Carse's book on Irish Metro-Vicks, which reminded me of this post. It states that A46 was the first A class to be painted in the darker green (and possibly the only one with a waistband, I'm not sure), but seemingly abou a dozen A class (named in the book) were painted in dark green in the period 1958-9 (likely due to existing in dilapidation in original silver). The lighter green became the new norm c. 1960. It goes on to say that A46 was the only one to go from the darker green to the lighter green, which in itself is surprising after such a short time in the dark green with the new B'n'T livery around the corner in 1961
I have looked for but not managed to find a photo of C234/109 (as it seems to have been used so little with the NIR)
It would seem that the port window was lost when she was rebuilt with the Maybach engine but there may have been no necessity to change this back when she got her GM 8-654E, I suppose.