The only reference I've seen is from Treebeard, and he wasn't sure, but thought Saruman might be "blending the lines of orcs and men - that would be a black evil." But you're right, Saruman was copying Mordor. Unwittingly. The (re)design of Isengard is referred to being like a child's copy of Mordor, though it's mentioned that he thought it very grand and didn't realize it wasn't his idea.
-Maril
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Deserves death! I daresay he does... And some die that deserve life. Can you give it to them?
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