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The kanji and the word are exactly the same. That means they share meanings as well.
The reading is the same as well. It's probably treated like on'yomi jukugo because it's attached to things (like numbers!).
何冊くらいいると思う？
About how many books do you think we need?
友達にもあげたかったので、その本を十冊買いました。
I wanted to give the book to my friends too, so I bought ten copies.
クーポン冊子を一冊もらいました。
I received one coupon booklet.
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