At least with Red Orchestra which uses Steam, usually after you d/l or even before it automatically d/ls a patch you can view the current game news and find a change log. Patch #'s are somewhat obsolete with Steam because everyone gets the patch when one is out whenever they sign on to the service, as long as you play the game and are connected to the internet you'll get an update if one is available, if anything they might go by dates.
For example patch one came out on xx/yy/zzzz, down the line (days/weeks/months) patch two might read aa/bb/cccc, all that information can be found in the change log which is available on Steam.
I think its difficult, or almost imposible to have patch mismatches for MP because the game will always update to the latest version if there is one available.
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