It is not that simple, that Boeing costs are in dollars and Airbus costs are in Euro.
There is plenty of US stuff in any Airbus, of course mostly in those with US produced engines. Remember that just one large GE
engine on a 330 costs around $10 million.
Same way a lot of foreign stuff goes into any Boeing plane and has to be paid with Yen, Euro or whatever, of course mostly those Boing planes with RR
All 737s except the vintage -100 and -200s have half French engines. Etc. etc.
It evens out the situation considerably.
But of course Boeing planes on avarage have a greater part of US production than the avarage Airbus plane and visa versa.