The same skin theme, very different qualities!

I was taking a look at the champion, to see what skins I had, when I realized that the skin '' Galatic Nasus '' & ''Galatic Azir '' are part of the same skin theme, but the Azir skin has a very superior to the Nasus skin, not only in splash art but also in the game and is not the only theme where this happens, in the skins_ Hextech_, where we have the skins of Annie and Gallio on the side of good skins and skins Janna Singed And Anivia on the opposite side. And this has nothing to do with the price of each one, because, for example, the skin '' Warring Kingdoms Tryndamare '' left by 975 RP 4 years ago and less than a year was launched the skin '' Warring Kingdoms Garen '' For 1350 RP, however the skins are of the same quality (in my view) but they do not have the same prices. I think some skins should be adjusted, do not you think Riot?