Yes, but note that the P1 workstations are pretty much the same as the X1 Extreme series (but with Nvidia's Quadro "workstation" GPUs rather than Nvidia's "customer" GPUs.)
It looks like the customizable variant of the P1 Gen 2 has different GPU options (including iGPU-only) based on what processor you choose, while the X1 Extreme Gen 2 has a Geforce 1650 in all configurations.
If I had known that when I was picking out an X1 for work, I would have pushed a P1 with no dedicated GPU instead.
nvidia have always been a hassle to use.