maybe one day when i get the time i'll elaborate and share a more comprehensive listing for all.
it all went pear-shaped when gay.jp (was that right? i don't remember now) disappeared. their codes were the ninja gold standard for full releases, and scene distributions were more or less exclusive. in the early 10's gay.jp went under, and i'm assuming a lot of the 1st-gen distribution contracts were up for renegotation. the orderly codes of the land of the rising sun in the east became a wild west.
ko-shop uses COAT#### codes, and coat dvd's are stamped with COXX### (COCO, COBL, etc., WEWE, WESS). CK-download omits the DV.
hyphens and leading zeros and each ninja's preference (or ignorance, but god bless their generosity) complicate matters.
as for the scene distributions, it's a mess. boys bank releases through FC, Rush, Hunk, and CK, but at least the numbers are consistent for the non-FCs, and the titles and scene descriptions are the same. HBM codes are horrible. one scene is released under FC, as well as HBM-AAA, HBM-0BBB, and HBM-00CCC, and not every scene is released through all channels, and since ninjas might ignore the leading zeros, it gets even more confusing. but the absolute worst and most unpredictable is nishiazabu. in the "big change" era they went from recognizable codes and consistent titles across sites to complete chaos. another one that irks me is acceed. both ko-shop and acceed use an ACSM prefix but the numbering varies.
basically, when looking for leaks you need to be dextrous and varied with searching, and it helps to get familiar with each studios release avenues and coding systems.