Is there a keyboard shortcut for switching between different desktops of the same application? There's the shortcut Cmd+tab for switching between open applications. Then there's the shortcut Cmd+` for switching between open windows of the same application. But if I have the same application open in two different desktops, neither of these shortcuts are really applicable. Cmd+tab to an app with multiple simultaneous desktop instances just goes to the desktop for that app that you were most recently using. Cmd+` does nothing.
For instance, I have the terminal version of emacs in one desktop. Then I have another desktop with some terminals. How can I easily switch between these desktops using only my keyboard?  The easiest way I see is to three-finger swipe up on the trackpad and use the trackpad to select the desired desktop.
I'm on Catalina, version 10.15.6.
How can I easily switch between these desktops using only my keyboard?

Here is a screen shot of System Preferences &gt; Keyboard &gt; Shortcuts &gt; Mission Control for two Desktops.
As you can see, by default, you can use control-left-arrow or control-right-arrow
You can also check the checkboxes for additional options, e.g.:

Switch to Desktop 1
Switch to Desktop 2

Then you can use, e.g., ⌘1 or ⌘ and the Desktop number for whichever you want to move to.

Terminal also assigns a keyboard shortcut for up to nine windows, e.g. ⌥⌘1 etc. up to ⌥⌘9