Well, it looks pretty straightforward for the most part. I'm missing some dependencies on my end, but I could get the gist of it. It prompted me about a Modern_concrete_001_Modified map that it was missing, although it has a non-modified version embedded. Since the overall color is blended in soft-light mode with the concrete texture at the end, could this be the part that has changed? If your concrete material was altered, or a different one used, this would explain the color change in the paint.
My guess, though, is that you intended your final blend on the BaseColor to use Copy mode, not Soft-Light As it is, the white and orange get blended twice in soft-light mode, once with concrete, and then again with the orange paint, with a mask. Setting the final blend to copy will give you full control over the paint color, regardless of what the concrete graph does. (although you'd still want this to be the same throughout development, since you want it to repeat nicely.)