Introduction: I think anyone who owns MH and downloaded the revised Curse of the Dark Pharoah already knows this, but, for those who're a little hesitant on buying MH because they don't have the revised Curse *can* play with the MH Curse cards.
First up, is that the five Exhibit Items will work fine with the old Curse Exibiit Items deck.
Second, if you download the revised Curse rules, one of the changes it adds is the Ancient Whispers Marker. Essentially, it's token that starts on the Miskatonic Streets. During your Encounter phase, if you're on a street, you draw an Exhibit Encounter card. MH comes with nine of these. Besides an encouner, the EE card will move the marker. If the marker doesn't move during the Encounter Phase, it will move like a Moon monster during the upcoming Mythos phase. Most of the nine MH EE cards bring the Curse Benefits and Detriments cards into play. (After looking at the rules, I wouldn't reshuffle the EE MH cards, though.)
I haven't played with *only* the MH EE cards, but, Arkham being Arkham, bringing in those B&D cards should make the game more lively...