answering to myself as answering to five postings in one go is impossible. 🤣
> Are there any obstacles that definitely make that a no-go? Do I risk corruption? It's both Linux, just a different distribution.
The question was a bit of an idea. So the glibc version in not known yet, but I'm highly confident that they will differ. A reindex could in theory be possible in most cases, but is a definite show stopper on some of our databases, because it would mean too much application downtime.
So, it's either logical replication or close to impossible.
If you don't do much DDL, the LR should be quite workable.
