Hi Gordon,
I can't say that I've tested welders to a prequalified PJP joint.
(Here's my opinion) I would test to a CJP and this would qualify them for Fillet, PJP, and CJP in the positions and thicknesses tested per Table 4.4. I think most places would test with a B-U2a CJP joint (page 40).
I don't want to lead you down the path the wrong way, so, I'll ask that someone would correct me if I'm wrong on this.
John Wright