For characteristics they are different, it depends on the kind of match.
"We are very unsafe in the offensive phase, but in the defensive phase we need to improve", Sarri concluded.
Chelsea's striker dilemma has been diminished in significance by the blistering scoring form of Hazard, whose man-of-the-match performance against Cardiff took his tally to five goals in five Premier League appearances this season despite completing 90 minutes only twice.
Called in for his first start of the Premier League season, Giroud repaid Maurizio Sarri's faith by teeing up the first two goals of Hazard's sublime treble at Stamford Bridge.
The 27-year-old is now the Premier League's top scorer with five goals, and he has contributed either a goal or an assist in each of his last eight matches for club and country.
"We can improve.We are not so solid as I want in the defensive phase", Sarri said, citing Cardiff's early goal from an unmarked Sol Bamba. "If you saw the game today, you have to say yes!"
The England worldwide was tipped for big things at Stamford Bridge this season, but the arrivals of Jorginho and Mateo Kovacic have seen game time hard to come by for Loftus-Cheek.
Next up for Chelsea is their first Europa League game against PAOK in Greece on Thursday. "[Giroud] played very well without scoring, but very useful for his teammates, I think".
The west London club are two points clear of defending champions Manchester City but Sarri said both City and second-placed Liverpool are "better" than his side.
'We can cope with the problems with the quality in the offensive phase, but not in the defensive phase. "I don't know what happened in the past but now he has a good chance".