No, TejRun are definitely not Sidnaaz and can't be.
Because, Sidnaaz were REAL, Honest with strong individual personalities(for good or bad).
Thy barely did 2 songs together in 2 years of togetherness despite massive hype and demand, never flaunted their relationship like other 2 BB couples( read Asimanshi/pahira) and shined in their individual projects post BB.
So, to the deluded members who are thinking them to be PR hatched couple who stayed together for work, better check your facts.
Coming to the most important point, Sidnaaz brought numbers while Tejran are driving away audience. I won't say sidnaaz was the only reason of BB 13 success, but they had a major contribution and are still loved by mass audience after 2 years of BB13.
I don't know if Tejran are real or not,only time will tell, but channel is definitely not over sidnaaz and desperatly trying for their next IT couple, in process tanking their own show.