Y0uve got to ask yourself what kind of idiot took them down and mixed them up. How hard would it of been to keep them seperate. Probably the same idiot who sells 2 greenhouses for £20 - the approx cost of 4 panes of glass!
A bargain
I'd be tempted to stick them togethet so one runs into the other. Then youll have some spare glass and (if you want) a door at either end