Either one should work so yes, you can use the second PSU, AC460AD-00, if you prefer.  Your machine is compatible with standard ATX power supply, you can use after market ATX PSU as well.
Hi I want to upgrate my 300W PSU to 460W on my Dell Precision 3630 to be able to use extra GPU. I have found two options, first the recommended one D460EGM-00 and second similar one for XPS - AC460AD-00. The difference is bethween : +12.0VC - 16.0A vs 8.0A                                                     +5.1Vaux - 4.0A  vs 2.0A also second one (AC460AD-00) have extra: -12.0V-0.3A. I have added pictures of labels. [IMAGE]   [IMAGE]  My question is may I use second PSU instead of recommended one beause I can find it on half price. Thanks for any help!          
Looking for correct PCU 460W for my Dell Precision 3630