Lister did end the CS series with the 8/1, production ended in 1984 would you believe ! To get upto speed on the genuine Lister CS I strongly recommend that you buy the bible, The Lister CS Story by David Edgington. You can buy it online from his website.
Listeroids are a totally different Jackanory all together ! The number of different manufacturers is prolific as are the experiences of buying, owning and running one !
There is a massive amount of information on this forum regarding the trials and tribulations of using a Listeroid, too much to condense here, so I suggest you make a cuppa, sit down and have a good long read through in the Listeroid section.
Some of the Indian made Listeroid spares can be used on genuine Listers, quality is variable but they have been used satisfactorily. The engines themselves are not identical to Listers, there can be many differences, eg, taper roller main bearings.
The consensus here is that if you can find the genuine item, don't even consider a Listeroid.