Hi Geneindawoods, and welcome to the forum.
I am pretty new here as well and my first build is also AL's Bluenose II model.
I believe the reference to the basswood planks #22 ands #24 are one and the same thing. I think it is just AL's way of separating the items of the Parts List based on what the part is actually used for, and not what it is made of or its dimensions.
In this instance, parts #22 (Deck Planking) and #24 (Side Waterways) are theoretically two different parts, but the same material.
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It confused me at first as well, especially having to identify parts based on their dimensions. The 'Quantity' column helps a bit, if you want to count all the pieces.
Also, AL does make some rather staggering mistakes in their wording which I'm sure you have already noticed. Their very first instruction (#1 - False Keel and Frames) reads:
'Ratlines' should be 'slots' maybe, and 'masts' should be 'false keel'
Good luck and enjoy the build, there are very helpful people on this forum
- Mark