Hey! I think they're different enough to justify all three bags if you really like the colour. I wanted a Bleu Brume Kelly too, but was offered Bleu Pale and just couldn't say no. Your bleu glacier ostrich MK is tempting me sooo much to ask my SA about one

I also think that K25 and MK are different enough to have bags in those sizes. Plus, just think of how many black bags most of us have in our closets... and we still buy more black bags haha.
I took a photo for you of my Bleu Pale k28 with my Bleu Brume oran charm and Bastia (so you can at least see the difference between BP and BB and compare to your Evelyne).
Long story short: Try to get a BB K too! There's no such thing as too much light bleu
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