Do thunder gods from different traditions have the same mythology?
Thunder is a recurring association, not proof of a common storyline, ritual or set of values. Comparing a pendant with a literary myth calls for special caution.
First tradition
Thor is well known from medieval Norse textual sources and Viking-Age hammer pendants. The surviving written narratives were recorded after conversion to Christianity.
Second tradition
Zeus and Jupiter share classical imagery linked to thunder and authority, but the Greek and Roman religious settings have different civic institutions and chronological evidence.
How to compare responsibly
Note both the date of a source and what kind of historical claim it can support.