Here you are a "fast and dirty" real source test... I found into that old HDD two files; first is the PAL GOUT, second is a 1997 SE test that msycamore posted about a year ago...

GOUT is PAL letterbox, and myscamore's test is NTSC anamorphic; the latter has (obviously) a different color grading, and different cropping too... to match a bit the colors, I ColourMatch'ed the latter to be similar to GOUT, then I added some borders to trying to align spacially the two images... as you can see, this is one of the worst cases, as there are three major problems to solve (letterbox Vs anamorphic, color grading, different cropping)

I cut a small clip (32s) because after that the SE had different scenes; playing the PaNup video shows that many scenes are visibly off alignment, while others are almost in line, in particular the last one... here you are some screen shots:

(you could note some artifacts onto the NTSC due to ColourMatch script)

I eagerly wait to test PaNup with proper material...