Dimensionally the east tower is a bit wider, but only by 6 feet or so. The east tower appears wider because of where the photo is taken. The angle of the photo catches the wider side of the east tower and the narrower side of the west tower as the two towers don't have the same orientation. The west tower is also further away making its dimensions appear smaller than the east tower. Size wise, the floorplates are generally the same (west-780 sq.m. vs. east-797 sq.m.). Shape wise, the west tower floorplate is more eliptical, while the east is more round.
Check out pg. 10 of the
Final Staff Report from 2009 for the typical residential building dimensions. Pg. 58 shows the building footprints and their orientation.