Sam & Cat är en spinoff av iCarly , så ja, De äger rum i samma värld.
Från Wikipedia-sidan:
Sam & Cat is an American teen sitcom that originally aired from June 8, 2013, to July 17, 2014, on Nickelodeon. It is a crossover spin-off/sequel of both iCarly and Victorious. It stars Jennette McCurdy as Sam Puckett and Ariana Grande as Cat Valentine.