When mixing ammonia and household bleach the chlorine in the bleach and the ammonia react creating chlorine gas which is deadly. Residual amounts of bleach on a wall aren't enough to generate a dangerous volume of gas in an exterior location. Also, when killing mold with bleach it is best to dilute the bleach one part to ten parts water (I have seen recommended ratios vary between 1:5 and 1:10). This too reduces the amount of gas that can be created. In my opinion it is safe to use one after the other if there is no puddling on the ground of the first chemical applied.
For cleaning purposes it is often recommended that soap be added to the diluted bleach. You get cleaning and mold remediation in one process and eliminate the ammonia. The final step is a long and thorough water rinse which doesn't react with anything.
The greatest danger is when concurrently using the two chemicals in undiluted form to clean a bathtub in an enclosed bathroom. The solutions are strongest, in substantial quantities, the space is not ventilated, and you are in very close proximity.
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