If the question is "will a computer that can run X-Plane 10 run X-Plane 11" then you should download the free demo on that machine to try it yourself.
If the question is will X-Plane 10 network with X-Plane 11, I believe the answer is no. We actually advise against using different point versions of the same full version (11.05 with 11.20 for example).
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