stop and think about your question for a second dude and you'll pretty much answer it yourself.....assuming you had the same core (venice) which you wouldn't once you hit 4000+ because I believe at that point it's San Diego or nothin, I THINK the highest venice is a 3800+ so lets pretend you have all venices for the time being.......
The ONLY thing that'd seperate them is the OC....if your 3500+ caps out at 2.8GHz and your 3200+ caps out at 2.8GHz then what do you have? Two 2.8GHz Venice chips.......exactly the same