From what you wrote, I thought you had got the DS pedal on. If not then having French threads seems more likely than both being shagged. French threads aren't that common here and Peugeot were using British threads even before they completely switched over.
Ah sorry no, it wouldn't go on. Visible inspection of the threads show them being very worse for wear, the first three or four are completely worn away/flattened. I suspect someone has tried to force some regular pedals on it before.
From what you wrote, I thought you had got the DS pedal on. If not then having French threads seems more likely than both being shagged. French threads aren't that common here and Peugeot were using British threads even before they completely switched over.