If it doesn't (or you're not sure), then try the other ones and see what you think.

If your Mk70 fits you well, don't change it.

The 'fit' is the only thing I would be concerned about if choosing between these Miroku guns. I know of 3 different stock shapes for Mk10's over the years, with no model designation to show the difference. Stocks are different between Mk70, Mk10 and Mk11, but are also different between different ages of shotgun. Mk11 is a different, new action which is not as deep in cross-section, and I think has mechanical trigger reset instead of Inertia trigger reset? Read up on the Browning 725 if you like - it's the same as the Mk11 action and there'll be a lot more info out there. Nothing in there is of great consequence in my opinion. Mk70 and Mk10 share the same action, but Mk10 gets the adjustable position trigger, Invector Plus chokes or Briley thin-walls dependent on era, wider top rib, ventilated rib between barrels etc. Can't disagree with much that has been posted above.

Miroku shotgun models explained