Gervinho netted the only goal of the tie.
"The result has changed, which isn't to be sniffed at. We had played well in the first half in Turin, but Juve did well to take an early lead and double it straight after the restart.
"When games are this balanced between two great sides, a single goal can be decisive," De Rossi told Rai Sport.
"We focused a great deal on set plays, which was where the goals came from in Turin, and perhaps playing at home made us a little bit more aggressive.
"I didn't see Juve looking particularly superior in Turin, nor were we particularly superior here. The two teams are on a similar level and I am pleased to say that."
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