Duet album question

Hi, I booked Duet last Saturday (yay!)

but I just realized, while we were looking through albums, I noticed they were all different styles (I think they are called 'magazine' and 'traditional' styles?

and I realized that we didn't specify what type of album we wanted... i was so excited I forgot lol

so... does one cost more than another? could we have saved money? does this get decided down the road?