To clarify, my problem isn't that I can't install an app because I have a similarly-named app; I am trying to update an app I installed via APK with another one of a later version.
I had previously downloaded YouTube Revanced from revanced.io, and a new version has been released, so I want to update it with the latest APK. However, despite acknowledging that I'm trying to update the app instead of installing ("Do you want to update this app?" dialogue), it still gives the "The package conflicts with an existing package" error.
Uninstalling and then reinstalling the app, though an option I have used, is inconvenient as I lose all my settings (there's no way to export them).