Find an assetref of a component, e.g. EC_Mesh, in the Scene Structure window. Right-click on it to bring up the context menu for it. There is "Open" and "Save as..", but no option to replace the asset reference with another ref.
There should be an option "Replace with...", which opens the same Asset picker dialog that the ...-button does in the EC Editor window.
Find an assetref of a component, e.g. EC_Mesh, in the Scene Structure window. Right-click on it to bring up the context menu for it. There is "Open" and "Save as..", but no option to replace the asset reference with another ref.
There should be an option "Replace with...", which opens the same Asset picker dialog that the ...-button does in the EC Editor window.