There aren't a lot of changes in the latest Surface Pro, unless you're looking at the Qualcomm-powered 5G model that replaces the Surface Pro X.
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Surface Pro 9 Review: Microsoft Flips to 5G - CNET
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Reviewing the Microsoft Surface Pro 9: fresh colours and CPUs, but
Microsoft Surface Pro 9 Review: Go for Intel, Not ARM - Tech Advisor
Surface Pro 9 Review: Microsoft's Evolution Of Versatility And Power
You can now pre-order Microsoft Surface Pro 9 and Surface Laptop 5