T500-w500 mobo swap also need someone to help locate a part

[tdawg5480]

Im 99 percent sure ut I want to be sure before I buy a new mobo that is the t500 and w500 are interchangeable parts im looking at this what i have installed now
42W8131 and getting 42W8133 only difference is doule vid ram right? still has switchable graphics? also if youhappen to have a t500 or w500 bpard laying around could you post a pic of top n bottom zooming in on the usb ports? Im trying to fix a broken usb port before i re tear the mobo apart hopping some one can tell me which way the pins are soldered the board as are all 4 pins are they side by side running left to right (assuming your looking from the top of the laptop....or do they run front to back. Thanks