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Thronebreaker: Do I get more reward playing again?

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Haven't finish, but I want to know this...

I didn't obtain all the chests from the first two maps, and I wonder if I will miss out the gwent reward for them unless I replay thronebreaker and find those chests...

Also, will the reward be different depending on difficulty?
 
The rewards are the same, no matter the difficulty. In the chests are premium cards and new borders for Gwent. That is what you would be missing.
 
The rewards are the same, no matter the difficulty. In the chests are premium cards and new borders for Gwent. That is what you would be missing.
Sooo if I missed a chest, I need to find that specific one in my new game? or just chests will do?