First time film camera user and I mixed up 2 unused kodak 400 or 200 film rolls in the used pile

As the title says I used a kodak snapic A1 and I am planning to get them developed but out of the 6 there are maybe 1-2 film rolls that I didn't use. Is there a way I can check or maybe do the film developers have a way to figure that out without wasting the roll or charging me?