Reverse Timing analysis (from .pof file)

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Even if you compile with the same version, you timing will probably be different. I'd re-compile and add any constraints needed to close timing. Make sure you completely understand what the real world timing needs to be for any external interfaces.

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In my experience with quartus (not ISE), going back to some very old versions, compiling the same source code with the same seed on and identical OS gives you identical results.