The newly added blocks 'Crimson Nylium' 'Warped Nylium' and 'Nether Gold Ore' should fit in seamlessly to a wall of Netherrack. Whilst this is true in the since 1.14 changed 'Default' textures, in the texture pack called 'Programmer Art' which is the textures of versions prior to 1.14, the base of these new blocks use the new texture so they really stick out. Picture provided

This is really frustrating for players, who enjoy the old textures more, because they have to make their own texture in a photo editing program.