Kiefernstraße vs. Landschaftspark Nord

I'm such a dumbass!!! The second roll I picked up today at the lab: failed! Although the result is pretty neat. Last weekend on my way to the lomowalk @ the Kiefernstraße I took a film that had already been exposed in January in the former industrial area Landschaftspark Nord in Duisburg. The result is okay - but the fact that I used differend formats drives me nuts!! :-S