can I view two different finder tabs at the same time?

With one Finder Window open, you can only view one tab at a time. You can get around that by opening two Finder Windows with the respective different tab views in each Finder Window.

DKST wrote:

I think I was remembering Total Finder which allows you to view two tabs in the same window. Unfortunately Apple's increased security has made Total Finder unusable without disabling security.

FWIW, there are other dual pane file managers such as Commander One, Path Finder, Martha, etc.

Just to add, you can drag one of the tabs into the Desktop which creates a new Finder window.