The two versions of Super Mario Party Jamboree for Nintendo Switch 2 do not differ in content, as both contain the full game including the Jamboree TV expansion with all Switch 2 features such as camera support, mouse mode and microphone functions. The only difference lies in the packaging and language version: this version here is the standard edition, while the other version is a multilingual retail version (DE/FR/IT). In terms of content, technology and gameplay, both versions are absolutely identical.
I'm not entirely sure; information suggests that the Switch 2 version (Nintendo Switch 2 Edition + Jamboree TV) is designed for the Nintendo Switch 2 and adds content and features exclusive to that console.
The base Super Mario Party Jamboree game runs on the original Nintendo Switch, but the extra content and features in the *Switch 2 Edition* are only available on Nintendo Switch 2, even if you buy the upgrade.
The language of the box for "Super Mario Party Jamboree" is not specifically indicated in the available data. However, the game is multilingual and includes several languages, including French, English, German, Spanish, Italian, Portuguese, Dutch, Korean, Chinese, Japanese and Russian. It is likely that the box will be in Japanese for the Japanese import edition, but it could also include information in several languages for the multilingual editions.
In Super Mario Party Jamboree on the Nintendo Switch, up to four players can play together on one TV at the same time, not 20, but there are online modes, such as the "Coopathlon", in which up to 20 players can play together online, and the "Bowser Kaboom Squad", in which up to eight players can play cooperatively online.
Yes, in Super Mario Party Jamboree there is a similar function to the Partner Mode from Super Mario Party. In this game, the "Partners" return, where a random character appears on the board and must be won through a mini-game to add them to your team. Each of these characters, also known as "Jamboree Buddies", has their own abilities and mini-games that must be played to win them and add them to your team.