Anyway it is the "rule" to replace pictures when there is a real quality improvement (with identical shot, if possible and if current one was not bad).
As Carchasesfanatic said, it is better to not cut: whole movie frame is better.
Note for the admin that will do the work: when adding pictures from Paulius as main pictures, you can remove the identical one from thumbnail, to not have duplicates on each page
I did one page (), I'll maybe do some others when I have few time, except if someone is faster.