organic chemistry - SN1, SN2 or acid-base reaction

I am asked to give the type of reaction (S_N1, S_N2 or acid-base reaction) for the following reactions. I know that both $\ce{MeOH}$ and $\ce{EtOH}$ polar protic solvents, so because the first is an S_N2 reaction shouldn't the second reaction be that as well? It says that it is an acid-base reaction as $\ce{MeO-}$ reacts with the $\ce{EtOH}$ to from 1-bromopropane, $\ce{MeOH}$ and $\ce{EtO-}$ and then goes on to from a S_N2 reaction.

I would appreciate if someone could explain why the second reaction would be an acid-base reaction at first instead of a S_N2 reaction.