Actually yes. In 2017 and 2018, the cards had a blue border instead of white and looked more like a picture frame.

Are there any other differences between them other than the number?

I have been collecting these cards for a while. While there are that many cards now, there are variations to the cards. If you look on the back in the small print, you will see a number (s18 for example). This number represents the year these cards were printed. (S18 = 2018, s19 = 2019, etc.) The same card can have multiple variations.