It'd be only worth it for the new dialogue scenes at the pirate's hideout, gremio's resurrection and Eikei's arena.
I think there are very few Saturn translations available at all, due to various reasons (pretty "niche" system and 99% of the relevant translations would be Japanese->English and Japanese translators are rare). If the file structure of the game is similar to the PSX version, we'd "simply" need to insert the PSX texts into the game and translate the remaining new bits - but I doubt the file structure is SO similar. It's always easier said than done.
Add to that that Suikoden has a small fanbase and romhacking/fantranslation groups are not interested in the title since it's been released in English at least for one platform.