No idea if they are but they sound dam close so wouldn't surprise me. Erm, MotoGP doesn't really lean on arcade, it's only the 2nd one from MileStone and they continued SBK's leaning toward simulation. On pro physics with all aids off it's is sim. It is on 360 and PS3, not sure what it's like compared to the next gen version that the PS4 and PC have.
Yeah, for some reason EA outdo themselves when it comes to sound. All the NFS games since like the PS2 days have had excellent sound recordings because the car's are under load rather than a rolling road. You hear every little engine detail and its a shame other dev's like PD with such huge resources get it so wrong.
From around Most Wanted (2005) onwards they have gotten even better, especially in Hot Pursuit (2010) etc.
Now whey can't ALL devs record sounds under load? They would sound so much more realistic as opposed to sounding "digitized" and synthesized or being looped.
Apparently, Mercedes-Benz wanted copies of the sounds of their cars in Driveclub, because the ones used in the game were better than the ones they had in their libraries.