I'd say they are close enough to be made in the same factory, perhaps a year or two apart? Regardless of how mass produced something is, there will always be an element of individuals completing things by hand/templates/suppliers changing etc
Then- I've got two of the same guitar, made in the same factory, in the same year, sold as the same model, one of which has a set neck, melamine finish and japanese tuners, and the other of which has a nitro finish, dutch tuners and a bolt on neck,  so perhaps I'm less likely to be incredulous 
