I think that's just labeling, at least with the Value & Plus. It was 585 & 600 (respectively) with identical cases, and when I measured them in the store (oh yes I did) they both measured about 670cca. The Maxx however was a different battery and heavier. I believe it was the premium JCI. it measured high 700s I forget exactly. and realistically they will all last >3yrs in normal use. This was a year ago for the 24F at my local WM. things may be different now.The CCA is different on all 3 batteries. I am not so sure it's the same build with 3 different warranties.
It's kind of like the Intel chip tiers... the low end chips actually cost more to make because they start off as the same high end chips. Then they physically cut part of the circuit off to reduce its speed. In this way they don't have to wafer fab multiple chip designs but they can still price discriminate. or at least that's what they did 20 years ago when I was still in the biz. it could be a whole different world now.