How are multiplying partial products and regrouping similar?

Partial products is breaking down every number in multiplication and adding them. Regrouping is grouping numbers then adding them. They are alike because they both involve breaking down numbers and then adding them. They are different because Partial products is taking all the numbers broken down, while Regrouping is just a couple of the number.

Partial products and regrouping are similar because if you use both you will get the same answer