Thanks for your reply.
I made sure that nothing was done to the JPEG when saving it (unless there is something I don't know about). The camera profile is set to Faithful and I have set everything to 0 in it. Also I did compare the image in the preview in DPP to the saved JPEG and they were identical (when I did a test saving at 100% size).
I don't care about matching the back of the camera either, but I do care about when one RAW converter seemingly starts out with more artifacts. The reason I saved it as JPEG was just to be able to show it easier. I can see the artifact difference directly in ACR's and DPP's preview.
Which RAW reader do you use in your workflow?
I'm not an expert on this stuff, but I think I read somewhere that DPP will take the settings that you have made in-camera for jpeg production and apply it when it doing the conversion. So, if anything it is DPP that is doing the extra processing, IMHO.
But, of course, ACR also does a conversion to their latest "process version", so it could be the fault of either one.
It is an interesting observation, but DPP doesn't fit into my flow at all, so I really don't care if DPP does a better job matching what is seen on the back of the camera.