Your confusion is quite understandable. Bc. Maikai 'Mayumi', Bc. Maikai 'Louise' and Bc. Maikai 'Lea' (notice the single quotes) are widely distributed clones of Bc. Maikai. There are also other clones and many unnamed seedlings of Bc. Maikai out there, and unfortunately many of them are confused or mis-labeled. They are mostly so similar, and all variable depending on temperature, light, etc., that unless you have them blooming side by side under the same conditions it may be hard to see the difference, and as I said many of them are incorrectly identified anyway. You can easily search internet images for any of them but don't bet on many of them being properly labeled. Of the 2 you asked about I think 'Mayumi' is often a darker color with few spots and 'Louise' may have slightly wider petals and more spots.
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