No. There is no other plugin. The is only one plugin and it is version 6 (currently). Vungle manages / updates their own plugin. Not sure why they never bother updating the corona documentation, but they do update their site documentation.
Both documentation on the corona site (v5) and vungle site (v6) state to add the plugin you should. So unless there is some magic it just downloads v6:
plugins = { ["plugin.vungle"] = { publisherId = "com.vungle" }, },
The corona site (v4) is different:
plugins = { ["CoronaProvider.ads.vungle"] = { publisherId = "com.vungle" }, },