The PAL and NTSC GOUT are definitely from the same masters (the 1993 NTSC telecine), but aside from the NTSC to PAL resize and slightly different cropping, it seems the PAL ROTJ was processed differently and had less (or none) vertical blur filter applied, there's clearly more vertical detail visible.
The NTSC ROTJ also has more 'ringing' artifacts like extra 'lines' around horizontal lines and contours, probably a result of to much vertical sharpening.
