The height differences make me want to put them in different brackets. Typically when comparing you look for same size/ I'd assuming you are comparing play styles in this instance so I can't argue that.
Hubbard has Preston Brown size both in the 6'5 265 - 270 range.
Ninkovich at 6'2 and lacking length would immediately make me draw my comparisons to other 6'2 guys vs 6'5 guys but again I think you are using play styles and I don't do enough scouting to make a comparison that way.