Double checking the Cantonese dub, I can tell that they were made by TVB. However, Chinese Wikipedia lists those made in 2005 instead of mid 90s speculated by simps (unless one of them are wrong). It doesn’t list the voice actors but I went backwards because I recognized the voices from other dubs they did. I’ll list the main trio, their actors and other roles they did:

Luke - Pasu Leung, Heero Yuy, Meowth, Frodo Baggins in Jackson’s LOTR (Only in Fellowship, Towers and The Hobbit).
Han - Kenneth Chan, The narrator in Chibi Maruko-chan, Kogoro Mori, Tom “Neo” Anderson.
Leia - Jingle Tsang, Sailor Moon, Yugi Mutou.

Interesting to see how that these actors did all kinds of dubs, which makes sense for a TV station. If there’s any Chinese speakers I would like to have someone reverse engineer the rest of the cast.