It looks like the 2013 team update and subsequently the 2015 manual have the part numbers swapped for the M7-RS-775-18 vs M7-RS-775-12. I just posted
Q409:
"R18 allows BaneBots motor "M7-RS775-18/RS775PH-6221." Motors received from Banebots with an M7-RS775-18 sticker have RS775WC-8514 printed on the case, and the M7-RS775-12 motor pictured on BaneBots' website has RS775PH-6221 printed on the case. Was FIRST's intent to allow both the M7-RS775-18 and -12 motors? If so, please update R18 to include the correct part numbers for each, as not all Banebots motors ship with stickers. If not, please clarify which motor is allowed per R18."