I used to belong to a group of photographers randomly scattered across the US (and sometimes one member would spend considerable time in Japan) and we would have a (optional) holiday print exchange. Each member would choose one image and make up multiple copies of each, they would all be mailed to one person who would assemble composite packets and mail them out to all participants. I would print up multiple Cibachorme print copies for my chosen image....printing up dozens of copies before sending them for distribution, I would set them all side by side to example them carefully and see if I could spot ANY difference between prints...NEVER could, in spite of very critical inspection. Of course, the enlarger was electronically timed for light output duration, the chemistry was controlled for temperature by a Jobo, but the air temp was subject to deviations of a typical HVAC thermomstat, so not as strict as pro lab standards. But I would not hesitate to dispute the statement about 'no two chemical prints are the same'.