Each addon runs through event_addon_loaded.
Add the other addon to your addons txt file at ##OptionalDependsOn: OtherAddon
In your callback function of event_addon_loaded you'll be able to check the parameter addonName == Other Addon finally.
Or simply check the other addons code if it got a global variable defined.
Inside your code check if this var exists like this:
If otherAddonVar and otherAddonVar.functionName then
--other addon is loaded
End
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