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Explanation: Basically I agree with Andy, there are lots of titles about which can mean about anything...
I'm fairly sure that neither of the ones you are looking for is a simple "Buchhalter", hence my two suggestions to keep up the distinction.
I suggest you have a look at your context and put "Leiter der Buchhaltung" (or "des Rechnungswesens", as Maya suggested) for the one in charge of the whole department, and "Leitender Buchhalter" for someone less senior who would be something like a teamleader.