I thought I had found some explanation yet I cannot find it anymore.

@kalvinhobbs – thank you. With org standing for organisation? Seems to be a North American thing, is there any major difference between C and K?

Thank you for the supplementary information.

C-Org - Usually the girls will be chinese with very rare european (usually no gfe,pse with white), standard price is 120half hour/160 hour. Sometimes the girls offer GFE without any tips, now BBBJ/FS become a norm with 40 /20 tips. Mostly all chinese girls will say ok to BBBJ with tips. They usually change girls every 2 week, so its hard to keep tab on girls because they keep on rotating the girls everywhere. Many operators are available and they lead to same hotel/apartment for each region, but they put flashy advertisements with chinese model pictures, usually it will end up with bait and switch, but some orgs will post masked old ladies which may be true. few orgs still post photoshopped girls. Its purely luck to get a good girl and then still you have to be get lucky to get good services. Most of them are rushed services in phony hotels. No verification/reference is needed, some may need your age/race and will be validated (occasionally) with last 4 digits of numbers with girls/papasan.

K-Org - They are organized, they verify your ID/Paystubs for their security. They post the photoshopped pictures in dedicated website. They have single point of contact (phone number) and the girls are better and sometime hot and young compared c-girls, Mostly Korean girls, sometime Japanese too, the service is top notch which includes GFE/PSE, BBBJ, BLS, DFK, shower together, rimming etc., more possibility to get beautiful girls and services. The standard price is 220Half hour/280 full hour, some org charges little more,

Please ask me more questions if you have any!!!!

… And ended up learning much more which is obviously great.
(My rating was cut short and I could not rate again.)