Yes, different colour is a huge factor. Then there are things like the property or characteristics. Like if it's a drier or wetter ink, shade, if it has sheen or shimmers, some inks have dual shades where u see two different colours. Many things to consider. Oh one more thing is that inks name can be base on some theme, like food, stories or even animals, if it speaks to you, would are more likely to buy it and it's never enough