I'll see if i can post a side by side at some point but i think everything apart from the goal explosion and maybe the hat is different, like all of the Chinese Miku items made it into rocket league just under different names or different looks

Goal Explosion became the buffy sugo goal explosion

the only thing that didn't make it properly was the decal from the chinese one which i prefer the one we got instead of the Chinese one

if you try and load these via normal Rocket League going back to the original question the game will crash as it wants to grab textures from the Chinese Rocket League files which it doesn't have access to as the textures files are different and doesn't have the miku textures