Have a look at the EGR plumbing, on the B it goes from a drilling/port at the back of the head to the intake, on the C there is a pipe direct from the EGR to the throttle body.
The C normally has a gasket which blocks this redundant port, but fitting an engine from a B, you would have an issue.
You could just block it up at the intake side, blank it off, fit the new gasket, or whatever, but you must stop that leak somehow.
Good Luck!
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