I'll keep it short - while the texture of the plain Terracotta block was changed in the Texture update, the coloured variants weren't and still use the old textures to this day. With that said, could the textures of the coloured variants be changed too to fit the style and look of the new regular terracotta?

You can see the difference down below in the attachments. The first picture was captured with the programmer art pack enabled - you see that all of the blocks use the same recoloured base, however the second picture shows the change of the plain block and how the coloured variants still use the old texture.