This time was different because Manchester United are performing badly in the Premier League this season and comparing both teams I would say Chelsea are the better team than Manchester United, the league table can testify to this too. It is not so shocking that Manchester United lost to Chelsea yesterday.
This is exactly, the worst season for Man United in the Premier League, no doubt. Man United dropped from 8th place last season to 16th place now. This is very different from Cheslea who actually experienced an increase in performance from 12th and 6th place 2 seasons ago and now rose to the top 3 temporarily.And one more bad fact for Man United is that:
"new history for Man United - failed to win in 8 consecutive matches in Premier League"
Source: 𝗥𝗘𝗖𝗢𝗥𝗗: For the first time in history, Manchester United