Technically, you can do that with EBSynth.
Just rigorously photoshop ROTJ Jabba into a still frame of ANH Jabba (do this a couple times) after which you use it as a reference frame for EBSynth to slap the face on and you’ll get a passable result (after masking everything else out to maintain quality), however you may need to do those in sections, as there may be moments wherein it wouldn’t track and it would look inconsistent, but morphing and masking can do the trick (most of the time, anyway)