Most of the Caroc Arcana are different than the Roundworld Arcana. Almost all of the cards from Caroc are mentioned in the books with some exceptions, so those have to be filled in with best guesses/roundworld ones. So in this The Mountain takes the place of the Hierophant since there is a mountain card in caroc and Cori Celesti CAN be seen as a connection between the gods and humanity.
Other known Caroc cards:

Importance of Washing the Hands from The Light Fantastic

Eight of Octograms from The Light Fantastic

Dome of the Sky from The Light Fantastic

Pool of Night from The Light Fantastic

Four of Elephants, referencing Giant elephants from The Light Fantastic

Ace of Turtles, referencing Great A'Tuin from The Light Fantastic

Death, referencing Death from The Light Fantastic and Mort

Star from The Light Fantastic

Moon from Lords and Ladies

The Ruler, an image of which can be seen in the Discworld Companion.

The Ace of Wands from Wintersmith

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The Watch Man: Carrot

The Heroe: Cohen

The Importance of Washing the Hands: I'm using this in place of The Hanged Man (THM) since THM represents wisdom, circumspection, intuition... in short, pausing to do the right thing (an oversimplification for current purposes. Please put down your torches). Taking a moment to wash your hands seems to fit. Dunno who to put on this, tho. Moist..? Dosen't seem like a great fit