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[Logician]

Yes this is possible:

What you have to do is create a "conditional" depending on user style variable, ie. $bbuserinfo['styleid']

So this should work:
-- cut ----
[[($bbuserinfo['styleid']==X)]]
your header for users whose styleid is X (Dont forget to replace X with style's id number)
[[/($bbuserinfo['styleid']==X)]]

[[($bbuserinfo['styleid']==Y)]]
your header for users whose styleid is Y (Dont forget to replace Y with style's id number)
[[/($bbuserinfo['styleid']==Y)]]

-- cut ----
and etc..

Let alone header, you can even design the WHOLE page in a different manner depending on user's style id, if that is what you want.

I am not at home now, so couldnt check if it works, but I cant see any reason that it wont.

Let me know if this is what you asked..

Regards,
Logician