As flagg says, the doors are more or less interchangeable, with the difference that the later doors are thicker. 
The change was in 1987, and although the later doors are better engineered, the older door you have, if it is in good condition, is probably worth considerably more than a later one, as these are a lot rarer, and most owners, as you note, will want matching doors. The doors from 1987 to current look the same and are interchangeable, although I think the last few years are steel skinned rather than alloy.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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