There was for the C2 runtime for the C3 editor, but as far as I know there is no direct conversion, or plug to use the Luna Litetween, or Tween behavior for the C3 runtime.
Im not even sure if its possible for third party developers to make a direct conversion that will load in both the C2 editor,and the C3 editor.
I would expect that you would need to make dummy events or documentation of how they work using comments in C2, and then remove the behaviors from your capx.