/fights urge to giggle at subject line /still fighting /not working.
in seriousness, it's not a great swap between LJ and the normal Scarlett (don't have pilot scarlett yet), and unless they changed the wacky neck on the pilot scarlett figure, I suspect it's not a great swap now, either. GR was right about one fitting too tight, and the other fitting a tad loose. But for me, the issue was the difference in how each sits on the neck of the other. That Scarlett neck is at such a weird angle that the hole drilled in her head to make it fit right really messes her up when she's placed on the LJ body.
I'll admit it's been months since I did this, but I know I ended up just drilling out the hole in the head then using hot glue to make it work.