If you have the small CX 2014.10, you should only team it with CN 2014.10.
This is from Post #1 in the CX 2014.10 thread:
Quote Originally Posted by kenta2 View Post
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FullCXEU-2014.10 (FID 800) Standalone version
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SmallCXEU-2014.10 To use this file you must have CNEU NT 2010 in your nuvi
If you have both the 2014.20 CN and the FULL CX 2014.10 loaded in your unit, just deselect whichever one of them you aren't using at the time.