Difference Between 8670 and 8670M?

[Living The Dream]

as stated in the title. Is there any difference between the two or is it the same steel with a different name used?

 

[P.Brewster]

The only place I see the name '8670M' being used is by Admiral Steel. A quick glance at their specs shows a discrepancy in the moly levels as compared to 8670.
8670M -- 0.05 to 0.10 Mo
8670 -- 0.08 to 0.15 Mo

Sources:
http://www.admiralsteel.com/shop/8670m.html
http://www.zknives.com/knives/steels/steelgraph.php?nm=8670