Obviously the new republic in Mandalorian's era still look like the rebellion but I'm more then certain they did change a few things about it's military on what they are outfitted with,
MOD:TOR Ports: KOTOR Comic Republic Uniforms for K1 - Mod Releases - Deadly Stream
Steam Workshop::[V-RP] Republic Navy Pack
Imperial military uniforms | Wookieepedia | Fandom
Republic Officer Costume From Star Saga 501st Legion - Etsy
Republic officer uniform : r/501st
Republic Officer (Admiral) by efrajoey1 on DeviantArt
Star Wars military uniform
Republic Navy Officer : r/starwarsblackseries
The Clone Wars concept art | Star wars clone wars, Star wars characters, Star wars rpg
ArtStation - Clone Officer Uniform
Star Wars Rewind on Twitter: "It turns out that the officer class in the #BattlefrontII reveal is a Republic officer not a First Order officer. #StarWars #Prequels https://t.co/bVoDT5d2Ed" / Twitter
Republic military uniforms | Wookieepedia | Fandom
Navy Officer | Star Wars Battlefront Wiki | Fandom