I wouldn't see why not, they're both same resolution etc. The only difference is how each device handles supersampling and scaling up frame rates to 90FPS when they dip below a certain threshold. My understanding is that currently the Rift handles this better than SteamVR.
I'm not sure if you use VR at the moment, but an estimate to base what FPS you would get on your current rig in VR would be to halve your current frame rates at least. So if you maintain 180FPS at all times in Elite on a 2D display you'll maintain 90FPS in VR, if not you would have to rely on Oculus ASW or the SteamVR equivlent in some areas.