From what I've read a pairing of Xhaka and Torreria as the CMs would be very different to what we saw previously under AW, even when we saw Coquelin partner Xhaka.
Our style under AW was narrow and centred around playing the ball through zone 14, which lends it's self to the midfield becoming heavily involved. By contrast Emery not only uses his CMS to support and cover, but Torreria seems to look to move the ball forward quickly rather than keeping it in midfield. Emery also reportedly likes to use width and the flanks.
NOTE: I use reportedly as this is only based upon what I have read, as I have not seen him other than limited coverage/interest in the CL with PSG.