Do I save fees through "import"?

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?

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.