The referee believes if a full view had been available of the incident between the Argentine and Joey Barton he would have dismissed the Manchester City striker
The 29-year-old midfielder was shown red by Dean on the final day of the season for his elbow on Tevez and his violent reaction to Sergio Aguero and Vincent Kompany, and has since been handed a 12-match ban by the FA.
But Dean admitted via video link to the regulatory commission that Tevez, who escaped without punishment, would have been dismissed too for his initial strike on Barton.
Commission chairman B.M Jones stated: "Mr Dean was questioned about the Tevez incident for which Mr Barton was dismissed. It was confirmed that neither the referee nor the assistant saw the alleged incident of Mr Tevez striking Mr Barton although Mr Barton immediately made representations to Mr Dean that is what happened, and such comments by Mr Barton can be clearly seen in the video.
"The commission accept that Mr Barton was aggrieved by the action of Mr Tevez and Mr Dean confirmed that had the incident been seen by the officials as shown by the clip supplied by Mr Barton, it would have been an automatic red card.
"The commission find that this does not however excuse the subsequent action by Mr Barton in relation to Messrs Kompany or Aguero."
Barton, meanwhile, will not appeal against his 12-match ban and £75,000 fine. The west London side also announced they would be carrying out their own investigation into the incident.
A statement from his club read: "Queens Park Rangers Football Club can confirm it has now started a full internal investigation in relation to Joey Barton's dismissal and subsequent events against Manchester City on the final day of the 2012-13 Barclays Premier League season.
"The QPR midfielder will not appeal against the independent regulatory commission's decision made on Wednesday and he and his team are now working in full cooperation with the club to assist in the internal investigation.
"The club expects the investigation to last at least two weeks.
"During this period, no one from the club or Joey Barton himself will make any further comment."