I'd generally pay the same for a good second hand body panel over a new pattern panel.
I remember a guy at my local parts counter mentioning that pattern parts HAVE to be a certain percentage different to the intended parts they replace, this doesn't make the PP faulty, or indeed any less suitable for the task it was intended for, but i doubt that Pattern mechanical parts are party to the rigorous testing that new cars are put through during development. The only criteria the PP has to acheive is that the suppliers of that particular item don't notice how many are returned!

Even manufacturer's of french or italian cars are developed, it's just that their respective OEM parts ARE very comparable to the pattern equivelant.
We are limited with the bongo. it was never released in our home market, i guess we should consider ourselves lucky that we can get our hands on ANY kind of part, be they original, or spurious.