r/soundfonts

I'm new to all things synths so bear with me:

I recently got a new digital piano (Kawai CA701) and I was looking into investing in some hardware that would allow me to recreate music from some of my favorite JRPGs (FF, etc). I watched some SoundFontGuy videos and saw various synths being referenced in the production of the same soundtracks: Roland SC-8820, SC-88Pro, and the Roland JV-1080.

Can someone walk me through the differences between these machines? Is it redundant to get all of these (i.e. what features overlap between these synths)?

Bonus question since I know next to nothing about synths: Is there additional gear I need to consider besides the synth itself? My goal is to be able to hear the samples from my piano's speakers rather than my computer if possible.

A few years ago I had wanted to create a Yume Nikki soundfont, but a lot of the samples used were rare and not posted anywhere on the internet as far as I knew. Very recently though, I discovered a WIP Yume Nikki SF (actually on this subreddit lol) with those rare RS7000 samples! Thus, combining findings from the VGM Instrument sources discord, various online sources, and ingame sounds, I managed to compile a full soundfont :D