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A same year motor will definitely increase the value to a collector. You just have to ask yourself if your car is anything close to collector quality. If it's a driver that will likely spend its life on the road having fun it's probably not really that important to keep the numbers correct. A car with the exact original engine is worth substantially more, I'd say as much as 25% in a very high end scenario. take that down a notch to an engine that is only in the right range for the year, and you're probably looking at 5-10% more value. Bear in mind that these percentages will diminish in proportion to the overall collectibility of the car.
I know those are a lot of variables, but that's how the market goes, always overly complex. But to answer your original question, every car has a specific engine case number that goes with it. If you request a COA from Porsche it will give the original engine number, but expect to wait months for the info.
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Porsche
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