I was just thinking about that, I vaguely remember the cologne lasting a bit longer on me but not much. Depends on your skin, why not give them a call maybe they can advise.
I've got both and the aftershave is pretty fleeting, but leaves your skin feeling very nice afterwards. I don't really view it as a fragrance I expect people to be able to smell more than an hour later. The cologne lasts longer, but it's also pretty subtle and doesn't follow you around all day either. It's a good office fragrance though - nothing overpowering or cause for complaint.