Recently I had the opportunity to play Ghostbusters Pro and LE side by side. One of my friends noticed that the LE playfield is much more blue than the Pro, which is very purple. Since then I've seen a few Pros and two LEs in person. All of them seem just like these to me eyes; Pro purple, LE blue. Apologies if this has already been mentioned in the other GB threads. They're too huge for me to keep up with.
I took a photo of each game: no playfield glass, same room, same lighting, same time, same camera, same flash, no filters. The difference is just as noticeable in person, if not more so.