J H Pierneef and Orange Van Gogh appear to be the same rose, at least insofar as Hortico has them stocked. I have both from Hortico and they seem the same to me. Now whether this was a Hortico error or whether they actually are the same variety, who knows. But don't go buying both of them from Hortico, as I did, and expect to get 2 different roses.

Does anyone else grow both of them? If so, what is your experience?

For what it is worth, on the Hortico site, J H Pierneef is shown as being a J B Williams rose, as is Orange Van Gogh.