It's critical on any engine - if the differences didn't matter, the aftermarket suppliers would just use one part number and list it as suitable for two, or more, models.
Could not have put it better myself.
Will add that different gaskets can be a different thickness as well, if the replacement s too thin it will increase compression ratio and risk valves hitting pistons, both will damage your engine. If the new one is thicker you will get very poor performance.
Your mechanic is having a laugh nad its costing you a small fortune no doubt.
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