[BB] All Known Formulas

I'd call that a minor difference, a major difference is that %wa only affects equipment. Potions and stars/bullets/arrows are ignored. So really with 200 + apples + 21%, you'll be getting 342 (%wa) and 363 (%dmg) if it's a class that doesn't have Use atk items.

It is possible BB changes this but I don't know why it would.

Looking at the Dark Aura thread:
11wa claw, 15wa star, 3wa BoF

1.75*(4*37 + 25)*29/100 = 87.7975 +0.5, round down = 88~

With Dark Aura (10% wa/ma):
302.75*(29*1.1)/100 = 93.8525 +0.5, round down = 94~

With DA (10% wa/ma) and warrior pot (5wa):
302.75*[(29+5)*1.1]/100 = 112.0175 +0.5, round down = 112~

Considering how potential stat% affects total stat rather than base stat only (MW), and that even bonuses gained from MW gets multiplied by your potentials, makes me think that stars and potions do get affected as well (as is the case for DA).