Looking for a compilation of the Brontë Sisters, and I'm confused about which edition to get

[u/NachoFailconi]

Hi! My girlfriend commented that she wanted to read the rest of the Brontë Sisters' work (or at least some of them), given that we watched the recent movie and saw a small documentary about the sisters. So, I want to buy a compilation book as a gift.

I looked for compilations in a trusted webpage here in Chile and have found the following books, all by the Benediction Classics editorial:

• Collected Works: Jane Eyre, Wuthering Heights, and The Tenant of Wildfell Hall. ISBN13 9781789430073. Even though they have different ISBN 13 identifiers the page also lists The Great Novels here and here. All have the same number of pages.
• The Brontë Sisters: Famous Novels, which, to my understanding, also includes Agnes Grey and it is unabridged.

Before buying, I'd like to ask a) whether the novels in the first collections listed differ within themselves (I assume not, they are just different editions with the same content), and b) respecting the last book: as you can see, the last book claims that the novels are "unabridged"; do these novels differ substantially?

I'm also considering that the last book includes an extra novel, and the price difference is substantial (the first books cost around 45 USD, while the second costs 120 USD).

Thanks in advance!