Retargetting can't find skeleton?

I have the default “AnimationAssets” folder with a standard UE4-skeleton and some animation and I added another folder to the project called “AnimStarterPack” which also contains a default UE4-skeleton with more animations.
I believe that the 2 folders actually have the exact same skeleton only they are different imports.

I noticed that in my AnimationAssets-animation persona I could not see the animations from the other folder:

This is probably because I have to retarget them from the UE4-skeleton to the other UE4-skeleton. So I rightclicked a random animation from the “AnimStarterPack” and select “Retarget anim assets”. Then I get a window where I can retarget it to the other UE4-skeleton but the list of skeletons is empty?

Here are the folder views of the 2 skeletons (which should probably be duplicates of each other I assume):

92711-bpa.png

92712-bpb.png

You have to “link” both skeletons. on the RetargetManager pick the bones of one skeleton (ue4 starter template manequinn for example), then do the same with the other skeleton (anim starter pack for example), then when you pick the animation you want to retarget it will show the skeleton as source (the owner of the anim) and the other skeleton as retarget candidate

or turn off show only compatible skeletons take the skeleton you want to retarget and it will show your skeleton if the skeleton have the same bones it will retarget if not you get a error hope this will help