Pretty much the case. the actual winch is identical, but the drive setup varied. The brackets etc were different, but also the assembly that holds shaft to the winch at the engine end. Note that the type of dog clutch and various other bits changed from Series 2 to 2a. Earlier, Series 1 & 2, had a sliding dog clutch engaging with three round pegs, but Series 2a/3 the dog on the crankshaft had a slot engaged by a crossbolt on the shaft with rollers on the crossbolt, and this, instead of sliding, was in a swinging bearing. Similarly, the earlier lever was a sliding action, whereas the later one was a pivoting action. 
But I would expect you could adapt the S2a/3 one to use on the S1, although it would probably require access to welding and possibly machining facilities, unless you can get the original Series 1 drive bit; but I think hen's teeth would be easier to find!
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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