Going back to the OP,
I would say that many courses have slightly changed over the years, but it is interesting to analyze the style of the course (boldness) and how this changed over time. Another thing to consider, especially with Ross, was that many courses were designed by him and yet he never say any construction or completion. This could mean that we could see designs that may not have been what the architect originally intended. Another consideration is whether or not the architect was truly interested in designing the said course. I can think of many examples where one course is top 100 in world and the other by the same architect is not even 100 in the state. This could be result of bad maintenance over time, not ideal golfing land to begin with, or just a poor layout.
At Mountain Ridge, the greens, general bunkering, and layout remain very similar to how they were designed (or atleast from what I am told and have seen), but one must note whether bunkers have been added or removed, greens contracted or expanded, new tees added possibly creating different playing angles etc.
At Plainfield CC, another local Ross course, similarities can be drawn to MR. What I see a PCC is a different boldness in the design, such as the dramatic 4th, 8th, 9th and so on. Maybe the land dictated the design of the holes, maybe Ross felt bold when laying the course out, but one feels a little more gentle when playing MR versus Plainfield.