Help me pick a book

Hey everyone,

Like many of you, I fell in love with the show and I'm considering purchasing the books, but I'm a little confused since there isn't much information in the store's description.

There are two versions: Shogun parts 1 and 2, with 700 and 850 pages respectively, and then I found a third titled just 'Shogun' that has 1300 pages (see pictures I provided). A difference of 250 pages isn't insignificant.

I don't suppose any of you have both versions, but does anybody know what the differences are? Or are both versions not worth it, and I should look for another edition? Thanks in advance for any tips.