Do I save fees through "import"?

General
1

For example, if I import these two instead of the code:

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import "@openzeppelin/contracts/utils/math/SafeMath.sol";

Do I then save fees when deploying?

Then I heard that you don't even have to import Safemath from 0.8.0 Solidity onwards, so it's redundant. Is that correct?

2

It is redundant and this can even change how ERC20 contract is written. If not believing it, check out this "modern" ERC20 contract.

There should not be a difference in terms of gas cost, since eventually it is the bytecode that is being deployed, not the original code or imported libraries.