You say PA28-150 do you mean the PA28-151? By your reference to the hershy bar wing on the PA28-140 it makes me think you're referring to the PA28-151 Warrior I as your regular ride. Does it have the semi tapered wing?
I don't think there was ever a Cherokee with the official designation of PA28-150 though some -140 models quite likely had higher horsepower engines fitted at overhaul and may have been called -150
The older hershy bar wing Cherokees were -140, -160, -180, the later Cherokees with the semi tapered wing were -151, -161, -181.
If the wings are different you need to be aware the hershy bar model will not float like the tapered wing tends to do on landing. Also if you get a bit slow the landing will be more of an arrival than it would be with the tapered wing.
The 140's with the exception of the very last models (identifiable by where the trim wheel is located, on the older one's it's on the roof, on the later ones it is between the seats) have a shorter fuselage, which means the cabin is shorter with less leg room in the back seat and they have a smaller door. These ones are really a 2+2 and not truly a four seater.
I'd certainly think twice and twice again before putting more than the equivalent of three adults into a PA28-140.
I think the elevator on the -140 era Cherokees is not as wide as the later Cherokees making it less effective.
Other wise fly it like a Cherokee. The -140 is no rocket ship but still a nice aircraft to fly.