Power Supply compatibility?

I am turning an Optiplex pc into a decent little VR pc, and one of the crucial upgrades I am doing involves a graphics card. With this, I will be well over the 280w maximum that my power supply can provide, so I am looking for an alternative. I saw a XPS 8490 power supply that has a maximum of 360w, which should work for what I need, but I am not entirely sure if the connectors would be compatible. Both use the 12v only standard and the connectors appear to be the same. I'm not sure if anyone else has ever tried this, but is someone knowledgeable on this topic to lend me some advice?