The only conflicting fouls that we're obligated to turn into a double foul are a block and a charge (note that a charge is NOT necessarily the same as a player control foul). That is because they're one act for which two officials have opposing opinions. (no need to reopen that debate again).
When one of the two fouls is something else, they're most likely not two opinions of the same contact but two different contacts.
In your case, it sounds like A charged while B committed an illegal use of hands foul. If one clearly came before the other, you could go with that and rule that the other was incidental (non-intentional dead ball contact). You could also go with a double foul if they were approximately the same time but the rules don't require it.
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