is the Royal Sacrifical Dagger Skin for 2x dagger like shown in the preview image?

do i need to purchase the pack twice in order to get a skin for each dagger?

When reading responses please keep in mind its all speculation as there are no daggers in the game yet.

Edit: when i get home from work ill check in poe 1 just to see how it works there, but usually 1 skin per weapon (i had to purchase duplicates of every single weapon skin i wanted to dual wield so far, no reason to assume this is any different)

P.s. the pack does come with a very similar skin for wand, could be what the picture shows (doubt it tho, since wands + melee are incompatible for dual wield)

any update?

The only circumstance in which you would need to buy 2 skins is when you're purchasing them from the shop. ANY weapon skin or weapon effect in a supporter pack, is automatically set for dual wielding, so you would never need to purchase 2 supporter packs. Only one is necessary.

There is one minor indirect concern here with supporter pack skins. The Mannequins available in the shop will prevent a character from using a skin. If you have a mannequin in your hideout using a specific skin, then no character could also use it at the same time. Obviously this is very likely irrelevant, but I still felt compelled to mention it on the off chance someone didn't know.

Hope this helps mate, good luck.