I went off and got a few hours SII to recompile this image into the Hubble (SHO) palette.
As you would expect the OIII emission has remained a constant in both images, particularly as it is mapped to blue in both versions.
The Ha and SII were very similar (except in the top right) and have combined to make a stronger, burnt orange appearance.
You may recall from my earlier post that the top right of the image had dense Ha nebulosity, but nothing in either of the two other wavelengths. Consequently this has taken on a paler look. In truth, it really should be a pale green in the top right - however, I changed this to suit the rest of the image.
Might be useful to download both images and blink them. Heres the link to the bi-colour version
thanks for looking