You absolutely can; the difference between a global and a DMG is absolutely huge.
If you are calling cheats based on someone's score and nothing else, they are likely not cheating.
[23:23:53] <AndChat|700625> Blue eyes ultimate dragon best card
[23:24:29] <AndChat|700625> You know the one with 3 heads
[23:24:39] <~Lightningkid> just like my dick
[11:35:40] <box> Hampa suck
[11:36:21] <hampa> not the first to tell me that today