There are many different forms for These items depending on who made them !! But usually a chamber pot was shorter, more rounded and had one handle and the slop jar had two and was taller !! But there is no rule to that,, Here is one by Knowles, Taylor and Knowles that has a two handled chamber pot and an additional smaller pitcher for waste water !!

https://www.southwestspiritantiques.com/dynapage/IP535.htm

It just depends on the maker as to what mood they were in that day !! Some days they may have made other styles !!
So your item can really be either you choose to call it !!