The above game has appeared in my game list, but I am not sure whether I am now supposed to use that or the Civilization V game.
Civilization V - XP2 (app 16871) is a configuration (probably somehow related to Gods and Kings expansion). It shouldn't be listed in your games list (it isn't listed for me, though I've had it also included within my subscription).
You should use the one you used previously.
At least it isn't like it was with Civilization IV some time ago, where both Windows and OSX apps using the same name were listed in the Windows Steam client.
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