Just love orchids. I recently bought that one from Carter and Holmes, so I remember what it looked like and double checked their website. It looks identical.

The point where the two petals meet the dorsal is rather different though. but there could be individual subtle difference.
Overall, they pretty much look the same. Only upon very close inspection, one can tell the difference.

Other than that, it's just the flower size and overal shape (how round it is).

Anyhow, yeah, large white phals are so classic.
No wonder it is always stocked more than half of all the orchids in the stores in the flower district.

Many business and home decor use white phals...