Possibly the package has been modified with the latest version. FC3T3 is only for testing to find bugs. This candidate release is probably for testing on different system and different motherboard. Don't forget Red Hat kernel include some of official kernel patches.
Desktop CPU: AMD Phenom II(tm) X4 Processor 940 AM2+ - Memory: 8GB DDR2-RAM - GPU: Nvidia Geforce GTX 460 v2 - OS: Fedora 18 Spherical Cow x86-64 and Windows 7 Ultimate SP1 64-bit
Laptop Toshiba Satellite C650D - OS: Fedora 19 Schrödinger's Cat (preview release) x86-64 and Microsoft Windows 7 64-bit