Need help in finding the diference

import random


class Die:
    def __init__(self, sides=2):
        if sides < 2:
            raise ValueError("Can't have fewer than two sides")
        self.sides = sides
        self.value = random.randint(1, sides)

    def __int__(self):
        return self.value

    def __add__(self, other):
        return int(self) + other

    def __radd__(self, other):
        return self + other

class D20(Die):
    def __init__(self):
        super().__init__(sides=20)

from dice import D20

class Hand(list):
    @property
    def total(self):
        return sum(self)

#my code
    @classmethod
    def roll(cls, num_roll):
        result = []
        for _ in range(num_roll):
            new_roll = D20()
            result.append(new_roll)
        return cls(result)

#borrowed code
    @classmethod
    def roll(cls, no_of_dice):
        dice_list = []
        count = 1
        while count <= no_of_dice:
            new_die = D20()
            dice_list.append(new_die)
            count +=1
        return cls(dice_list)