Enum as a interface and used in other contract

sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity 0.8.9;

interface interEnum {
    enum SIDE {
        buy,
        sell
    }
}

contract B is interEnum {

    function bEnum(SIDE side) external {
        // do something with here
    }
}

contract A {
    B b;
    enum NUM {
        buy,
        sell
    }
    function bEnum(NUM num) external {
        // i cant pass in an enum from here.
        // invalid explicit conversion from uint256 to Enum when i tried it this way
        // b.bEnum(uint256(num);

        // b
        // invalid explicit conversion from enum to enum....
        // b.bEnum(num);

    }
}