I’m almost completely sure they’re both NTSC. Also, for the sake of correction, it’s a Sony PD-170 not a PD-150. Also, this is strictly a problem in Premiere Pro. My old workflow involved Premiere Elements, and I would transfer the tapes, deinterlace them, edit, produce an interlaced AVI from them, and then burn to DVD with Nero, no problem.
I’ve been playing around with the field ordering and the final AVI render. Exporting it as a 24p seems to lighten the jerkiness from one camera but make the other a touch more jerky. I’m now trying the “reduce flicker” option instead.