JazzG I don't think those two players are the same. For me Rice would thrive more in Xhaka's position and Caicedo in Partey's role.
I think they're both very similar actually. Both very nippy, both high in tackling stats, both make a similar number of passes, touches etc. I think they can both play either role, but I'd trust Rice more with the responsibility playing the 6 role.
Interestingly, they're both top 10 in the league for tackles. Partey is 15th. Xhaka is no. 148 (8th at Arsenal). Easy to see where we can really step things up next season when it comes to suffocating teams, high turnovers etc.