It turns out I bought the C-Map/Jeppeson chart packs for Indonesia
and beyond, and thus, for the Torres Strait region, have both Jeppesen AND Navionics
for the same area ... I have not done a thorough analysis, but for the area around Thursday Island, the Jeppesen chart has ever-so-slightly more detail on navigational aids ... and in a few cases, a few more depth
Both track each other (and reality) for the coastline/shoals/bars, etc.
Of course, the underlying data is almost surely Australian, and it remains to be seen what portends in Arafura Sea and beyond ...
Just an unofficial report -- use care in using any charts, obviously.