Yes, you are correct. If you stick to 12/15, it will save you from another break if eqemu comes out with a new version by then. Hope it helps
Also by the way, mostly all Sony Updates are eqgame.exe, eqmain.dll, EQGraphicsDX9.dll(rarely this one), and eqhost.txt which is what you change. So no need to backup your entire EQ Folder, I only suggest you backup all eq DLL Files, EXE's and the Resources and uifiles folders...