They are definitely different, from what I've heard.
I like what QueenDomino adds to the whole thing, but I've been told that the feel of the games are very different. Both good, but one doesn't necessarily feel like a sequel to the other (though that being said, you can combine the two games).
@Mirefox I love seeing other rankings. I just wish I played more "new" games to actually do a Top 10 of the year. But more of them were 2017 games than I had thought there would be.
And just wait until my supplemental list comes out!
I'd love to play the fantasy Clank just to see the differences.