An operator runs the casino site and manages player accounts. A slot provider...

https://wiki-byte.win/index.php/How_Do_Casinos_Mix_Games_From_Multiple_Providers_in_One_Catalogue%3F

An operator runs the casino site and manages player accounts. A slot provider makes the games. Provider names show who built each slot and help you compare titles in a catalogue. Visuals and sound may differ, but they do not change the game rules.