It'll be a little stiffer.. Definelty not too big though.. I just got the 155 wide, I weigh a little less than 190 at the moment and I was a little suprised at how stiff it is
Wide models are always stiffer. All else but boot size equal, a 155w will be stiffer than a 155 reg for two riders.
Wider models support a bigger weight range than their regular width counterparts. So if I'm on a 160 regular and you weigh the same but with big feet... you can go down to a 155w and we should experience similar flex.
In theory that is since I don't ride wide boards lol.