Technically the Costco code is NEWER (v3.0) than the Pro code (v2.96 or something like that). I seriously doubt that Lyman expected v2.96 to be the last release for Pro.
Changes:
* Single slot coin door
* No Joker reveal mechanism
* No ramp diverter
* No mini-playfield or ramp feed to the right flipper
* No teeter-totter mechnism
* Reduced general illumination
* No Joker drop target
* Plastic main ramp
* Originally sold for $3299