101 wheel nut part number is 90577473 and is not a unique 101 part - so I guess it is the same as a series 3.
The nut for the front wheel step is part number 592926 and the book does indicate it is unique to 101s (at least in 1977). I assume you appreciate the normal wheel nuts bolt onto the special step nut to hold the actual step on.
I know you have part numbers for everything so from this you should be able to work out the specific answer to the question which is most like yes - the actual nut thread is the same.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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