If the headspace is too tight a round may not chamber, if too loose the brass may be overworked worst case perhaps a case head separation. Realistically the variation in headspace tolerance amoungst the three rifles is probably so small so as to be insignificant. If the manufacturer has not marked the bolts with the rifle's serial number like Winchester and other manufacturers do it would be a good idea to vibro-etch the serial number on the underside of the bolt. That way you can be sure that the correct bolt has been installed in a particular rifle.
