Yup, but in all cases the currency will be responsive to the aggregate economy, not the local economy.
I'm not very knowledgeable about African economics, but that said, I think that the downsides to a common currency experienced by Greece will be a much smaller issue in Africa, because stability is more important than monetary policy tools and "natural" inflation during debt crisis. The monetary solutions (market and/or policy solutions) just aren't available to most of the smaller African economies anyway. OTOH, currency stability is a problem and common currency generally helps with this.
I'm not very knowledgeable about African economics, but that said, I think that the downsides to a common currency experienced by Greece will be a much smaller issue in Africa, because stability is more important than monetary policy tools and "natural" inflation during debt crisis. The monetary solutions (market and/or policy solutions) just aren't available to most of the smaller African economies anyway. OTOH, currency stability is a problem and common currency generally helps with this.