Just change the pledge amount.
Etc. if you want 2x A3 prints, change the amount from 350DKK to 700DKK. And send me a message about it, or let me know in the survey.
If you want a mix, A3+A2, then choose one of the pledges, and change the amount= 350DKK + 450DKK = 800DKK.
Send me a message if you have any doubts :)
Then the shipping cost will be the same.