Ran into this problem too. Found a workaround for this, it’s a gross one, but it works! You basically create a duplicate of your new asset that is mapped to the original rig, add the duplicate to the override, then delete the asset and “replace reference” with your new animation that you want to use. This is basically forcing UE4 to populate your list with the asset used on a different .
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Go to the asset you want to use that isn’t showing up in your Override list. Right click > Retarget Anim Assets > Duplicate Anim Assets and Retarget
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In the popup window, uncheck “Show Only Compatible Skeletons” and select the original of the parent anim graph.
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Go to your overrides list and select the new asset that now shows up in the list and save everything.
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Go to the duplicate asset and Delete it.
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On the Delete popup, click “Replace References” in the bottom left corner (if it is not showing up there that means you haven’t saved the file yet).
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Delete any and all extra files that were created upon retargetting the original asset.
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Repeat for every single anim asset until the end of time.
Can this please be fixed guys? It would help a lot.