India products are not meant for local use in Tamilnadu. They are sourced by local/Otherstate sellers from indian suppliers.
The main differences are as follows:
Firmware differences - There might be differences in firmware as compared to a local set which may result in compatibility issues with use in Tamiln Nadu Safety Mark for power socket items - The product may not carry the necessary safety marks as required in Tamil Nadu Warranty - The warranty period may be shorter than that for local products or Tamilandu Prodect. Customers may be required to ship the product OtherState at their own cost to claim the Indian warranty.
IDA Compliance - The product may not be tested by IDA.
Instruction Guide - Manual/be in a English.