Yes. Office 2019 is the older perpetual version. Office LTSC 2021 is newer but similar in concept.
If you have a key from a "top list" that seems to work, follow these steps to check its legitimacy: microsoft office 2019 product key list top
If you want, I can:
Unlike its cloud-based counterparts, Office 2019 offers a "perpetual" license, meaning you own the software forever once activated. I can: Unlike its cloud-based counterparts