I think so, looking at what position would win you.
chess.com opening data base for 3 day chess

As @BobbyTalparov said, opening databases are allowed for Daily Chess. So are books, videos, magazines, etc. See below for what is allowed.

Of course it is legal in daily chess, that's why there is a link to the database above the move list!
is it cheating to use it for 3-day chess? I haven't yet but just wondering.