V3 to v4 migration considerations

I need to setup a v4 instance prior to cutting over to v4. I’m using a centralized mqtt cluster for my v3 instance and want to add on the v4 to test prior. Since both v3 and v4 application service utilize the same topic structure, can v3 and v4 share the same mqtt cluster without interfering with each other?

For the application integration, I don’t think there is any issue that the topics are the same. Please note that for the GW <> NS there is a difference (as v4 introduces a region prefix, e.g. eu868/gateway/....).