Both the T-90S Bshima and the Arjun use Kanchan armour, as mentioned already earlier by Kunal Biswas. The main difference is that the T-90S has a much better turret shape with much smaller weakspots.And wrt your tall claims on T 90S having better armor - PROVE IT.Give us the chart showing what kind of materials in what quantities went into both systems and then talk .And if you can't (which I know you can not by the way),then don't bother replying to my comment.
ToT does not mean you get all sorts of technologies and are afterwards able to completely manufacture any components of it. There are two mayor factors people here are never taking into account when complaining about the lack of ToT:- If Russia has not completely transferred tech to India , then what is the meaning of signing TOT ??
1.) What technologies actually were part of the ToT agreement? If the Indian government did not request and pay for some technologies, the Indian government will not get these. If the Russians betrayed you, would the Indian government still order new tanks instead of canceling the orders and sueing UVZ?
2.) With whom did the Indian government make the ToT agreement? Probably with UVZ or Rosoboronexport. But not all parts inside the T-90 are made by UVZ, many components are made by different companies and UVZ simply buys them in order to create their T-90. The gun or the armour are not made by UVZ, so they couldn't even give you said technolgies even if they wanted. Some components, like most electronics and optics of the FCS aren't even made in Russia, but in Belarus.
It's like making a ToT agreement with Ford/Renault/VW and afterwards complaining that you weren't given the technology to produce modern tires! FordRenault/VW do buy tires from different companies instead of making their own.