switching colors in PROGMEM stored icons

The same applies to you or any other poster.

Please post a link to the ACTUAL displays. (or a photo of your pcb)

It means that the reader can identify your device (or have a pretty good guess)
And the punter gets appropriate answers to her questions (sometimes complete solution within hours)

In your case, the Chinese board and the Adafruit board will probably be known by library authors like Bodmer. And you would get the benefit of his knowledge and experience.

David.