The eye style is different from Season 3 as I see it. While it's similar, it's not the same.
• The top eye shine has changed. It has moved more to the center. Due to this, it can't cross over to the side of the pupil, so I think it covers less of the pupil. In addition, it may have become more circular, but I'm not sure.
• I think there's less of the lighter color in the bottom of the iris. If there isn't, then I think it's a darker color. The main color of the iris might be darker, too.
• For Usagi, Ami, and Makoto, the top of the iris doesn't border the eyelid/eyelash (there's the white part of the eye in between). I think there isn't any white space in between for Minako because she's turning her head.
Some pics that I used to compare to season 3:
https://s-media-cache-ak0.pinimg.com/73 ... a6e1c2.jpg
https://i.ytimg.com/vi/7equ4no-mU8/hqdefault.jpg
http://www.sailormooncollectibles.com/w ... r2016a.jpg
(I know the last one isn't the best example due to it not using the exact colors from the season)
If I got anything wrong, or you see something differently than I do, feel free to correct me.