@pcrepier 
Did not see your question before, but I have exactly the same one: Reading zones with identical names using TecplotReader into Paraview - ParaView Support - ParaView. It appears to be a bug to fix and I made it into an issue: TecplotReader issue with similar named zones (#22144) · Issues · ParaView / ParaView · GitLab (kitware.com). Hope it will be fixed in the near future…