I think you're right about both, Antonio.
Like with many orioles, the tail of the young Yellow-backed is olive colored, so everything in your photos looks good to me for that species.
It's more curious to see the almost orange tail on the bird accompanying the adult Orange Oriole in the other photo. Taking the situation one would assume it is also an Orange, but I can't find any references, my literature or photos or photos online, that mention or show anything about an Orange having a tail colored like this. A light and color artifact..?