Windows 10/11 Enterprise is an update for the Pro version of the physical PC. Windows 365 is a virtual Cloud-PC with apps, data and settings in the cloud. See below plans and prices for Windows 365 Enterprise.
Windows 10/11 Enterprise E3 is part of Microsoft 365 E3, contains besides Windows E3 also includes Application Control, Application Guard, Credential Guard, Device Health, Cloud Activation
Windows 365 Business with 2vCPU, 4GB RAM, 64GB Storage is for companies with up to 300 employees, that can get started with the cloud PC within 1-2 hours, similar to a physical PC
Windows 365 Enterprise with 2vCPU, 4GB RAM, 64GB Storage is for larger companies, with no limit on the number of users. A Windows 10/11 E3, Endpoint Manager and Azure AD P1 are required
For non-profit organizations, there is also Windows 10/11 Enterprise with the same features, but at reduced prices. You pay only about 20% for Windows E3 and about 35% for Windows E5. For educational institutions (schools, universities, training and research institutions), Windows A3 and Windows A5 are available.