2013 buick regal 2.0T lhu engine. Vaccum pump from zzperformance is smaller but fits perfect should i be worried check pictures below.

Hussein55644

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2013 buick regal 2.0T lhu engine. Vacuum pump leaked so I bought one from zzperformance but noticed it was marked 10 and not 12 but when I put it on it fit perfectly but seems smaller. Should I be concerned? Heres the part number of the pump I got from zzperformance 12632504.
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