Alternative to :FindPartsInRegion3

So basically a while back someone here told me to use :FindPartsInRegion3. But before I could learn how to do it I noticed that it is deprecated.

Please note: I am not using this for terrain, I am trying to detect if a part moves inside of another part.

Could someone provide information on an alternative method/function to :FindPartsInRegion3 and explain it to me?

All replies are appreciated. Thanks!

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