Andy..
        In 20 words or less (or more)....  The net list check reflects the
  electrical design, while the gerber data reflect the phototooling. The 
  phototooling may reflect errors that were generated by over-riding the
  DRC (design rule checking) of the routing software or other TRICKS 
  erroneously incorporated into the phototooling by the designer...the
  pwb would equal the gerber data, but would equal BAD PRODUCT!! That being 
  said, if your not transmitting RS274x gerber data and a wrong aperature 
  or wheel is used to generate the manuf. phototooling, assuming that you
  didn't supply reference phototooling, erroneous pads/traces could be
  generated and again BAD PRODUCT!!  IMO, the safest way to guarantee GOOD
  PRODUCT is to supply RS274X data, netlist data and a set of reference
  phototooling. This might be a bit of an overkill, but I would rather have
  pwb's being stuffed in the assembly area then me being in incoming inspection   trying to figure out how to make make BAD PRODUCT work. Hope this helps.
                                                   Regards,
                                                              Bob Vanech
  

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