^Xiao'Guang is, as far as I know, 100% the same between Belle and Wise with zero dialogue changes other than using the proper gender pronouns for each. She comes off as extremely lovey dovey with whichever proxy you pick, much like Vivian. Differences between the two proxy's events are very minor but there have been a few. Most notable ones are Wise pretending to be Miyabi's fiance in her second affinity event while Belle says "she's marrying into the family." Her dad talks about adopting you no matter which proxy you pick though. Another difference is in Caesar's movie date event when you call it a date as Belle she kind of laughs and goes "yeah" whereas with Wise she gets flustered. I believe Astra has one different line in her movie date too, though I still feel like she's plenty flirty with Belle in that event as well.