John B. wrote:

I Don't understand why you keep asking for
information that is unnecessary.

If it isn't on the box, either there is no
difference, or the manufacturer has made a poor
job. Only that doesn't sound like Shimano given
what we know how they are with documenting
their products!

One way of finding out if it is stated on the
box, is to write down *everything* and
then compare.

If this doesn't reveal the difference, the next
step would be to get both chains, open the
boxes, and compare them visually as well as
with tools.

If one can find a difference, one can write to
Shimano an tell them to put it on the box.
If one cannot find it, one can write and ask.
If they can't find it either, one can say they
should put on the boxes that the chain is
functionally identical to another model - or
better yet, drop the two distinctions
altogether and merge the products into one.

--
underground experts united
http://user.it.uu.se/~embe8573