Sep 28, 2017 - 12:23 PM
They are interchangeable if you talk about the month that is coming after the current month. But you could use "próximo" in situations when the month is not the one coming after the current one. For example let's say we are in September, and you say "In January I will go to Mexico, and the following month I will travel to China". In this case you would say "En enero voy a viajar a México y el mes próximo viajaré a china". El mes que viene is only for the month following the current one.
Sep 28, 2017 - 12:52 PM
@Fabrice. Thanks for that explanation. My experience with the upgrade so far is that it is overall more detailed and this is a great example.