g00fy

Hey guys, first post here, looking to get some insight. I've got an older Sunrise Spa hot tub that I picked up off craigslist 5 years ago. Until I mothballed it for a year to rebuild my house the thing worked great, especially for what i paid for it. Now I've relocated it into it's new home under my deck and a bunch of problems have come up I assume from sitting for a year. First thing i noticed once i got all wired up was one of my 2 motors was seized, I'd hit the jet button and I'd hear a buzz in the motor, but it wouldn't spin, even after breaking the shaft free. So I enlisted the help of a good friend of mine who works at a local Motor & Pump repair facility, they work on stuff from spa sized up to 1000hp industrial size. Before he got to my house, the other motor which was working, also died, same symptoms, motor buzzes, doesn't spin. At that point i also noticed my Recirculating pump seal was gone and flinging water everywhere of the shaft. We pulled all the pumps and motors out of the tub and he took everything apart, all my motors appear to be fine, capacitors seem to be alright, bearings are OK, but not great and since we have everything apart we're replacing all the seals and bearings. Unfortunately during the disassembly process, both of my impellers got destroyed because the shafts had gotten so corroded. I looked at the impellers which had tons of part numbers on them for all different HP ratings. So I saw my motors said executive 48, 5.0HP, so i ordered 5hp impellers. This is where my problem/question comes in. The impellers showed up and they're different, they're about 1/4" thicker then my factory impellers, same exact diameter. So I looked closer at my stock ones and noticed near one of the fins inside the impeller it says 3hp. So my question is, can i run this 5hp impeller on my 5.0hp motor? or should i go through the extra expense and hassle of swapping it out to a 3hp impeller? What negative effects might i see running this 5hp impeller? Thanks.