Name is what the processor was sold as while specification is the actual die designation. It's entirely likely that your X3 was originally a business line X4 that simply failed or got binned down to an X3.
@candle86: I dont think you understand quite how binning works. If there is high enough demand for X3's, AMD will take even fully working X4's and bin them down to X3's to meet the demand. They have a choice of selling less X4's and not selling as many X3's as they could have or losing a bit of profit on the X4's and selling enough X3's to meet demand (and more than make up for the deficit for selling less X4 dies as actual X4's)