I would shoot them as you suggested and see which one you like best after that. If you were looking for the detach magazine then that would help you decide as you would have the dbm for the new rifle stock already. Personally, for a hunting rifle, I prefer internal magazines. One less thing to forget to grab or hook on jacket/brush and worry about loosing mid hunt

As far as aftermarket parts go you should be able to use the same stocks with either rifle, I believe there the same screw spacing. Which also allows you to make either one the blind or detach mag rifle with the current rifles you have. Scope base will obviously be different but plenty of good options for either in the hunting category as far as that is concerned