Again, Mark F is right on.
Tony, I think the investor would think that, given the differences in topo, his design was unique. I once used the exact same plan on two jobs to show an associate how much the shaper makes a difference, as Tim suggests. Even I couldn't tell they were the same plan!
As suggested in the first post, I have done a bakers dozen courses around DFW, and am conscious of not repeating greens or tee shot concepts around here, whereas if I am working somewhere else and am "in love" with a certain idea, I would go ahead and copy it closely, if the land allowed.
Other factors work in - I have repeated template greens - like Road, Redan, Biaritz, but used them on different length and/or par holes because I am not sure that the Biaritz works as well on a long three as a short 4, for instance and want to find out.
There are probably 18 original holes at the Quarry, because of the dramatic land. However, I have a reverse redan green (but on the long par 4 12th) and the "sombrero green" on 7, which I have used a dozen times in 22 years. Tim Nugent would recognize it as the third at Kemper, but with a quarry in front rather than a pond. The concept just works for me, so why not use it. While the 13th, 16th and 10th are different versions of a double fw that I have used often, I don't think of any of them as templates. 10 would be the most recognizeable to anyone having played one of my courses. The others fit really unique topo and are different enough that the double fw concept works out to be unique.
We have debated just how much something has to change to be an original. The same hole on different topography or in different wind condtions will look and play differently. Putting chocolate drops rather than bunkers might change the mental aspects, as would hairy bunkers or large bunkes over ones with perfect sand.
As to making something work for my current project, whether I am starting with an old idea (mine of someone elses) an idea I have been waiting to try somewhere, or an idea that comes to me as I stand out in the land (although some percentage of what springs to mind is something I have seen or done somewhere, and that percentage is increasing as time goes on) The real key is to flesh out the concepts to make sure they really work on site, in context of the golf course and also in details - like circulation through the golf course, sun angles, etc.
Beleive me, I have tried to copy greens from one site to the next, both in hand drawings and computers. By the time I flesh out the details as above, its never an exact copy. The closest you can come is on transferring a green on dead flat ground to another site with dead flat ground. Otherwise, I find myself tweaking so much that it might have been easier to start from scratch.
I have always said I would love to have the problem of so many projects that I would have to become repetitive, but I haven't run out of ideas yet. And, lets get real - Go to the Tufts archives and you can find the same Ross Par 3 hole - maybe 173 times out of 400 he used a template. Maxwell, RTJ, whatever. There are even starting to be whispers that the current top designers are starting to get predictable. Its a tough issue any successful designer has to deal with, especially if they get national exposure.