When you hold an item in your hand in bedrock edition, the item appears way bigger than how the item looks in your hand in java edition.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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I don't see an issue here, all of the items in both versions seem the same size on your video. The same can be applied to items that I tested.
Did you use the same FOV in both versions of the game?