Well, I doubt anyone has the exact same build, but I can guarantee that it's all compatible and there shouldn't be any problems.
The benefits between the two are small, yet I would still recommend going with the more expensive one if you can:
-It has a much higher quality psu which will allow the build for more and better upgrades.
-It has double the RAM, so you don't have to worry about upgrading the RAM in the future. Buying this set of ram will be $50 for 8gb. If you go with the cheaper build you'll be paying $30 for 4gb, and then another $30 for the same 4gb, giving 8gb total for $60. In the long run, it's cheaper.
All of the names are hyper links, so you can click on them and it will send you to the product on PCPartPicker. From there, you can see the different retailers selling it and the prices.
Both Windows 7 and 8 is compatible with both builds. Just make sure to get the 64-bit version.