Is there a difference between using a dict literal and a dict constructor?

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Using PyCharm, I noticed it offers to convert a dict literal:

d = {
    'one': '1',
    'two': '2',
}

into a dict constructor:

d = dict(one="1", two='2')

Do these different approaches differ in some significant way?

(While writing this question I noticed that using dict() it seems impossible to specify a numeric key .. d = {1: 'one', 2: 'two'} is possible, but, obviously, dict(1='one' ...) is not. Anything else?)

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