I downloaded historical data for Reliance for approximately 2.5 years for Reliance today in two timeframes, one minute timeframe and one day time frame. I noticed that the opening price of 9:15 minute in one minute timeframe data and opening price of the day in one day time frame data was not the same. Similarly, the closing price of 15:29 minute in one minute time frame data and closing price of the day in one day time frame data was not the same.

Please let me know the reason. Should'nt they be same?