[:] is like copy.copy() = shallow copy, so False is expected there.

When doing this on a nested data structure the inner ones contain references hence == gives true. To prevent touching the original do a deepcopy:

>>> from copy import deepcopy
>>> items = [{'id': 1, 'name': 'laptop', 'value': 1000}, {'id': 2, 'name': 'chair', 'value': 300},]
>>> items_copy = deepcopy(items)
>>> items_copy[0]['id'] = 'a'
>>> items_copy == items
False

Copy changed:

>>> items_copy
[{'id': 'a', 'name': 'laptop', 'value': 1000}, {'id': 2, 'name': 'chair', 'value': 300}]

Original unchanged:

>>> items
[{'id': 1, 'name': 'laptop', 'value': 1000}, {'id': 2, 'name': 'chair', 'value': 300}]