If the colour is my favourite colour and I will buy different colours of same style of H bags, I must buy same colour in different style. I have B30, Lindy 30 and Shoulder Kelly, all in BJ. I also have Birkins in different colours (e.g. Bois de rose, gold and dark green) and Lindy 30 (in red, sanguine and iris) in different colours. BJ is sharp, very pretty, best matches with my clothes , not easy to get dirty and can be used from Spring to Winter. I do not feel boring.
However, if your collection of H bags is limited, it is not recommended buying same colour of H bags in different styles.