Another difference is that the Tour Bags are hinged at the front of the bag, while IS bags have a 'hook', and lay to the outside when opened... This is to allow better access to the bags, when the bike is equiped with the IS trunk.
Black Dog
What Black Dog says is true,
Tourer bags will only work on an I/S, if you change the hinge out.
Other wise the Touer Pack won't let the lid open.
Mounting hdwe is all the same.