Yes, MeOH can replace EtOH in most instances where the role of the alcohol just is as solvent, with possible adjustment in volume if the solubilities is different.
The only instances I can think of where the substitution does not work is in some sodium/ethanol reductions, some NaOEt/EtOH alkylations/condensations (as NaOMe is not as basic as NaOEt) and in some NaBH4 reductions where MeOH decomposes the borohydride too fast. And naturally, you cannot make a substitution in those instances where ethanol is a reactant, for example if you want to make an ethyl ester by refluxing an acid in ethanol.