just to begin i don't know for sure if this belong on this topic.. (i can change if it doesn't)
so I have two cold iron carver
1 > has uv - vs beast low
2 > has uv - vs undead very high
i want to use the very high one when i upgrade to 5 star..
question > How do I make sure I am useing the right one?
can i just equipe one and it will use the other?
Yes, that's one way of doing it. I believe you can drag and drop your desired sword into the slot where "Cold Iron Carver (Level 10)" goes as well, but don't quote me on this. Hover over the sword to make sure you've gotten the right one.