Are they too similar in size? I already have the mini flap.
In the same or different colours?
if its different color -- definitely NOT overkill
I think it also depends on your bag budget. If you can afford to buy new bags a lot, then if you really like a style, go for it, But if you are on a limited bag budget, you may want to try a different style, so not everything looks similiar.
I would love ot have multiple bags in the same or similar styles..but since I am on a bag budget, I sometimes have to pass on ones I love to vary the collection.
i think the mini and the e/w are too different to be mistaken for each other.