Unarmed Strike of Brawler and Monk

[Sha-dow]

Since both Brawler and Monk have ability of deals more damage with her unarmed strikes (and they have the same name and description), If I multiclass monk and brawler, will the grow rate of the unarmed strikes damage stack with each other?

Ex. Both monk and brawler`s unarmed strike damage dice will grow to 1d8 instead of 1d6 in Lv4, how about 1 brawler/3 monk?

[LoneKnave]

Sadly, the ACG explicitly comes out and says that abilities from parent classes don't stack unless they say they stack. So no, they don't. But you probably shouldn't grab more than a few levels of either, so it shouldn't be too much of a problem.