Yep. The picture you posted of the top of the grips to show the difference in length caught my eye...the blue grip on the Mizzy looks like it might not be on all the way or something like that.
Are all the Mizuno irons that much longer than all the Hogan irons, or is each club a little different? Or do you just have the 5 irons for the Radials and not the whole set? You could also measure them like this to find out:
Should be 37 3/4". I'm curious on which one is not the stock length.