Tough question to answer without getting very long winded about it. SOme are made to fit the CS type, some are made to fit the India changes. This another reson why I like the clone engines verses the Listeroids.
We have very little old stock Lister parts for the CS types here in the states. I see some advertised from time to time in Europe and for the prices I see I get disinterested quickly. I find the Indian wear parts to be very satisfactory, most approaching excellent in quality. I use them in my CS Lister builds without hesitation. Rod and main bearings, rings, valves, pistons, fuel injection equipment quality is right up there.
As Gary said you have to be careful with parts as there are many versions of the engine built from an exact clone of the CS Lister to engines that bear little resemblance other than they have two flywheels, run slow and look the same from a distance. There is a fellow over there in OZ that imports and services Indian engines (or used to be?) Ozroids or something like that? You might check in with him.
We are lucky here in the states that Gary has invested the time and effort to import clones and parts. I have also bought from Central maine Diesel when I needed wet liner blocks, liners of 5 stud cylinder heads.
If dealing with India or anywhere else you need to be specific in your requests, Gary mentioned the fuel pump differance, fuel lines can be had that adapt.
Pistons- can be iron or aluminum in several bore sizes plus common oversized. Some use the standard CS ring configurations, some do not. There are also pistons for the direct injection 'roids.
Ring sets- Anything you desire can be had from India or here you can buy direct from Hastings
Cylinders- CS type blocks without liners are available that are also the same externally with the bolt on doors on each side. There are also blocks that are OEM externally and take a wet liner.
Con rods- are all the same in my experience.
Rod bearings- available in many undersized and in both babbitt and bi-metal types.
Valve guides- I am not certain if India makes the screw in exhaust guide? In the past I have installed liners in the original guides. India also messes up the fit sometimes as there are both 7/16" OEM and 11MM India versions.
Valves- all will work in a CS type but my experiance with them is they will be 11MM stems and be a loose fit in the OEM guide even if not worn.
Crankshafts-differ from bushing main to TRBs.The bushing manin cranks will fit a CS