I took a few minutes to mull over the two cards and basically, with the current wording and how they work, I don't think there's any discrepancy.
Darkclaw's current wording is, "When Darkclaw deals combat damage to an ally, the opposing Hero takes 1 damage."
And Infernal Gargoyle's is, "Stoneskin - damage received is reduced by 1"
In IG's case, the wording uses "received" which would normally be deduced as damage is first dealt, and then damage is reduced by 1. Darkclaw's description using "when" would associate the 1 damage dealt to opposing hero to the same time as Darkclaw deals damage to an ally.
Regarding balance for Darkclaw, I haven't even used the new Darkclaw so I'll reserve comments on that topic until I have.
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