Here's a site that can tell you whether two steels have the same composition, though I'm not sure how the owner would feel about scraping.

http://zknives.com/knives/steels/steelgraph.php?nm=M390%2C%2...

It even includes manufacturing process information on individual steel pages:

http://zknives.com/knives/steels/Crucible/cpm_154.shtml

zknives.com/knives/steels/Crucible/154cm.shtml