Does it matter, though?
If a spell appears in SpC that's the version you are supposed to use.
PH2 overrides SC, PH2 is the later source. And yes, it does matter: It determines if Wands of Circle of Vigor are more cost-effective than Wands of Lesser Vigor. From my math, I don't think so. But I suck at math, so I will likely need to be corrected.