Why would you care of the value ? You have one of the best shotguns ever made and if it is a 26" and not a 28" and it
shoots good for you , go hunting ! About the only thing different in the 2 is , you are 2 inches farther away from your targets.
If this really worries you , by a pair of RX's and look again !
Go pattern that Sucker with the shell of your choice and see what it likes but , remember , move-up 2" closer !