I haven't used a color picker to check saturation, I judged by looking at the pictures in the second set. Anyway, the brick wall does not look like it has identical exposure in both pictures.
I am wondering how the OP has done his adjustments. I think that using sliders in any software is not going to produce a linear shift of the values. I haven't tested it yet, but the best bet would be to use the curve tool and shift linearly everything.
They were not identical exposures, the second was two full stops over, then reduced two stops in DPP before converting to 16 bit TIFF.
I don't use 'sliders' to alter an image, this was tweaked in curves to balance the appearance. A very minor adjustment but I can't remember now, and these files are deleted anyway.
Using a small amount of ETTR is well established for assisting in a number of circumstances, and often something that I would do if faced with a single exposure shot of something in high contrast. However my point was made because of the LL article advising that the 'correct' exposure for a black cat in a coal hole is to expose the raw as virtually white, even given the date that this was produced.