Two stupid questions…is the wb exactly the same in each scenario and are you using the automatched tone curve?? If so the model used in that feature greatly changes the color… I don’t use RT as a daily driver but you can toggle the options and see… its a bit like what you see with the color preservation modes in DT and the way that they can impact color when used as part of the processing… you may have checked both and if so ignore… or on the other hand you could try that and cycle through the options and see if one comes closer…
EDIT
I Just went back to the old post… I guess I suggested this already but I didnt’ see a reply to confirm if you tried or it was an issue…