I had assumed that the difference in performance would be due to different ecm fuel maps and possibly injectors but it is possible that the camshafts and/or valves are also different.  LRA may have supplied whatever they had on hand that was at least minimum spec for your vehicle when built.
In the early 70s a mate bought a new, last of model run Falcon 6 cyl that flew.  It appeared that the engine was from a special test batch built for the next model's high performance spec. vehicles.
				
			 
			
		 
			
				
			
			
				MY21.5 L405 D350 Vogue SE with 19s.  Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
			
			
		 
	
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