A family of Microsoft suites of integrated development tools for building applications for Windows, the web, mobile devices and many other platforms. Miscellaneous topics that do not fit into specific categories.
Yes, if your Visual Studio 2022 license is a qualifying Visual Studio Subscription, you can generally use the Visual Studio 2019 Build Tools as well.
Microsoft's licensing guidance states that Visual Studio subscriptions include downgrade rights to prior versions of the software. Visual Studio 2019 Build Tools are also available through Microsoft's older-downloads page for eligible subscribers.
However, there is an important distinction:
Active Visual Studio Subscription: VS 2019 Build Tools can be used under the subscription's downgrade rights.
Standalone VS 2022 license: Don't assume that the VS 2022 product key can simply be used to activate VS 2019 Build Tools. The licensing terms and activation method are different.
Build Tools: They are not automatically a separate free license for commercial development; Microsoft's guidance states that use of Build Tools requires an applicable Visual Studio license.
So, if by "VS2022 license" you mean an active Visual Studio subscription, the answer is yes, VS2019 Build Tools can generally be used under the downgrade rights.
If you have a standalone VS2022 Professional/Enterprise license, I would recommend confirming the exact license terms with Visual Studio Licensing Support before deploying VS2019 Build Tools, rather than assuming the 2022 key covers the 2019 Build Tools.
Microsoft also provides VS 2019 Build Tools through its official older-downloads page for subscribers.