Please don't post NBA 2K11 modding topics in the NBA 2K14 section. Also please post any and all modding related topics in the appropriate Modding subforums.
For faces, 2k13 faces can be converted to 2k11. Since they're the same type of file (proof of this ar the files used for urb 2k13 and 2k14) I'm assuming that 2k14 faces could also be converted to 2k11 format.