pankaj , the CS has had some - though cosmetic, but significant changes.
A new LX variant vas launched,
The interiors and exteriors were revamped. the indigo grille & headlamps instead of the indica's
analog clock, different door pads etc.
I doubt you will get a CS TDI. I'd say the life of the TDI engine is not too different from that of the indica DLE engine. About 80 to 100 thousand Km without a rebuild. maybe more of less depending on whether it runs mostly in the city or highway.
If you dont want the boot, look for an Indica turbo Preferably DLG/DLX turbo , 2007 or later.
the turbo charger itself costs ~15k, and if you want to be really cheap, and know where to source one, you can get hold of a used/reconditioned turbo for less 
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