But isn't the original question about brake boosters, not MCs?
For boosters...the vacuum port is on opposite sides. Other than that, it is interchangeable, as far as I know. You'd need to redo the vacuum hose to reach, or get the S14 hose to match the booster. Seems easier to just swap the right one.
As for MCs, it is silly to swap S14/S13 MCs. Internally, they are roughly the same (neither is an upgrade for the other), but the line placement is completely different. You'd waste at least half an hour rebending the lines, when you should have just gotten the right MC, or done an upgrade that warrants bending of the lines).
Dennis
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