OK, I did some homework and found a lot of parts interchangeable, listed below. There are parts listed for both engines under the 'Jetronic Control' section in the parts catalog, so I assume the fuel injection systems are similar then?
I thought that I read the 560SL 117 engine has an aluminum block, true? So that might mean design differences, and therefore maintenance/repair procedure differences? That is my main focus in this thread, trying to establish what major differences in these engines would necessitate getting a manual with the right steps for work on the 5.6L 117, given that I am familiar wtih the 3,8L 116.

I sure hope someone with experience will comment soon. My gut feel is that I already have enough info in my 116 manual to do most jobs, and what I don't know I can find out when needed, probably here.

Parts shared by 116.963 (380SE) and 117.967 (560SL) engines:
Main bearings
Rod bearings
Lower gasket set
Rockers
Timing chain tensioner
Intake & Exhaust valve guides
Lifters
Oil pump
Oil filter
Air filter
Spark plugs
Cold start valve
Fuel filter
Starter
Alternator
Power steering pump

__________________
1986 560SL
2002 Toyota Camry
1993 Lexus