I would say no.
I've seen some pretty windy explanations on this board saying otherwise, but never with any justification.
- venontjare = in the year that is coming
- sekvontjare = in the year that is following.
If there's any difference, it could be that venont- is absolutely "the coming year" (2020 as i write this in 2019) while sekvont-) is relative -- so listen to context clues.
- Sekvontjare, ARE estos en nova loko.
That means that in 2020 ARE will be in a new location. (It may well be - the decision hasn't been made) If I had said instead:
- En 2020 ni provos novan lokon por ARE, sed ni eble revenos al Silvero la sekvontan jaron.
That would mean 2021.