^That's what I think of with TGM, not necessarily any other album. While the compositional techniques BTBAM uses aren't really metalcore, their riffs seem firmly rooted in it, especially when you mix in the breakdowns.
Anyways, the difference between Death metal and deathcore seems pretty obvous to me. Death metal is far heavier and brutal with more agressive riffs, faster blastbeats and riffs, lower growls and bass/guitar, and an emphasis on technicality. Deathcore is mainly more hardcore based shouts and a huge emphasis on breakdowns, and really I don't see a lot of similarity between the two genres, besides the superficial elements like the amount of double bass and the distortion level of the guitars.