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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
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I think that in English the phrase "177 contains the same digits as 117" is, at the very least, not obviously false? "The digits contained in 177 are 1 and 7."; "177 is made using the digits 1 and 7."
The specification "contains the same digits" seems ambiguous to me in the case where a number has repeated digits. For example, 1272: is the solution 1271 ("contains the same digits") or 1227 ("is a permutation of the input digits")?