new_list = [14, 15, 16, 17]
old_list = [17, 20]

print(new_list)
print(old_list)
print('===========')
del_val = []
set_val = []
for i in old_list:
    if i in new_list:
        pass
    else:
        del_val.append(i)
for i in new_list:
    if i in old_list:
        pass
    else:
        set_val.append(i)

print(del_val)
print(set_val)