Most of the time such swaps don't matter much, but sometimes they do. Most users will never notice a speed difference in their SSD, so the PC make would rather ship with chips from other suppliers than put a popular product on backorder. Many companies, therefore, choose to substitute parts with equivalent options instead of delaying sales to consumers. Without diving too deep into why SSD manufacturers can vary between models, it is common industry practice (except for Apple, who uses a custom storage controller and chips from Samsung, works in lower volumes than most PC manufacturers, and in using a custom solution isn't competing for a limited supply).
In fact, almost every laptop I have tested in the last two years has different SSD manufacturers often for the same amount of storage. Microsoft is likely sourcing two different SSD brands for a few reasons, including just supply and demand. Additionally, things like firmware and driver revisions can affect such scores on a real PC. Those are, however, theoretical speeds – hence the "up to" bit – achievable only under ideal conditions.
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