With Ratchet being out in Canada, I figured I could take some images to show just how different this mold is from Ironhide. The retool connotation has been outdated for ages now and the advent of computer aided drawing meansthe actual mold doesn't need to be retouched to give something new. You can some parts at the design level and then mix and match the existing and new molding. Which is why while Ratchet may look similar to Ironhide at first glance, the amount of new parts outweighs the amount of parts shared with Ironhide (which is mainly the chest, feet and back of the legs).
Below you will see the difference in parts for Ratchet's head, shoudlers, chasis, wheels, pelvis, vehicle "grill", front of legs (inner molded detail is different as well), hands and forearms. The later are asymetric since one of his forearms has four extra tools molded in as detail for the medeical bay mode.