Back in May, Bedrock’s leather horse armor got updated, but the java version still looks super unfinished to this day. I made a post about the same thing happening with the netherite horse armor. Bedrock's armor has a unique look, but Java's is just retexture. A lot of people said Mojang is testing what players prefer, but judging by the leather horse armor not being the same on both versions, that doesn’t really seem likely.