The only risk you suffer is over or under development of one of the films. There's no risk of "cross contamintation" or anything like that.
I assume that you already developed at least one of the films and know that the time you have is good. This film will develop as it always does. The other film will probably develop quite well as well. (It will probably be very slightly over or under developed).
Of course, the best way to find out is to develop them...
I believe that you will be ok, however.