I assume the extra seats are rear facing - I had heard that these could be obtained after market for the RRS.
The RRS is shorter and has a shorter wheelbase than the D3 so floor length in the rear is shorter than the D3.  However I have a 55l ebay no name fridge and it will fit in the rear on the passenger side lengthwise with enough clearance to shut the top door so your 40l should fit Ok.
Cheers
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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