Omc Prop - Need Help

[Blue_Runner]

OMC gods....HELP!

After spinning the hub on the Mckee craft, we are in need of another prop. I found a few on fleabay, but have a question. The prop that spun the hub is a 13 spline 11 3/4 x 17 OMC part number #386841. I found one exactly like it online, but I'm conerned it is old and it looks like someone painted it. I also found one that is a 13 spline 11 3/4 x 17 and is brand new but it is OMC part number #176422.
http://cgi.ebay.com/ebaymotors/ws/eB...275520639&rd=1

So, why the 2 different part numbers for what would appear to be the same prop? Are they really different? Do I have to have #386841 or will #176422 work interchangeably with my shaft? Motor is a 1988 40hp evinrude 20 inch shaft.

Thanks,
Blue