Not much to say, the base plate of the Armor stand still uses the old version of the stone texture (or smooth stone if you want since its just a recolour of the normal stone texture).
I made an example fix that you can find in the attachments with a comparison to the old and new stone textures. Alongside that, I fixed the side faces of the base plate which don't use the colours from the outline for some reason. While this is a small thing, I recommend fixing that too.
By the way, I think you probably won't but still, you can just use this fix I made. Of course, no need to credit me or anything, it's still just based off the textures you made and that's all. Your take would probably result in the exact same, if not very similar look.
The armor stand base does not use the stone texture, it instead uses the smooth stone texture (MC-222763).