Hi parter,
Sales Hub and Sales are the same, both belong to the Dynamics 365 Sales Application.

When you purchase a license for Sales, you are actually buying the Dynamics 365 Sales Application.
After you get a license for the Dynamics 365 Sales Application and install this solution, you will get the Sales Hub.
The Sales app (web client) is replaced by Sales Hub by default in the current version of D365.
The difference between Sales Hub and Sales app is that the interface is different. Sales Hub is a unified interface interface, and Sales is a classic UI interface.
The classic UI is about to be abandoned, which is why the Sales app has been replaced by Sales Hub.
If you are referring to Sales in the D365 price list, then it refers to the Dynamics 365 Sales Application and some of its related applications.
