First off the word you are looking for is comparable. Second of all Brook is a big man of course he's going to average more rpg and better FG%. That would be like me using VC's 3P%, FT% and APG against Brook.
I'm sure if Vince dunks on Mourning, Duncan, Mutombo ect. then he'll have no trouble dunking on that fairy Brook Lopez.
Also 20.8 FGA is very low for a 28.8 ppg average.