Two of the following proverbs have similar meanings. Which ones are they?

Question

Two of the following proverbs have similar meanings. Which ones are they?

Quizplus · Accepted Answer

Proverbs are short sayings that express a traditionally held truth or piece of advice.
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Necessity is the mother of invention expresses that if a person is in great need of something, they will find a way to get it. 
No hill is so steep, but a donkey loaded with gold can climb it expresses that money can be used to reach the highest of places, even by a foolish person.
What's done is done expresses the fact that once is something is done, it cannot be changed.
A bad penny always comes back expresses that often unwanted things or people will continually and predictably turn up every so often. 
It is no use crying over spilled milk expresses that there is no use in lamenting over something that has happened since it cannot be changed.
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What's done is done and It is no use crying over spilled milk are similar phrases because they both express the idea that things that have been done cannot be unchanged, and there is no way to change them.

Two of the Following Proverbs Have Similar Meanings. Which Ones Are They