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Alright buddy, I did a deep dive on your behalf. Followed and compared part#s and finally found a Garrett wholesale spreadsheet. So the 2971 IS a genuine Garrett CHRA. It isn't a listed complete turbo, just the middle spinny boi parts, which is great?that means it's all dyn balanced.
Based on the chart, if you were expecting a .48a/r 2871, the 2971 has a ~3mm larger comp wheel on both measurements and is a .84 trim vs a .76. The turbine however has the same inducer diameter, but has a 4mm larger exducer, and only comes in a .56 trim, not a .48 trim, hence the larger exducer. That said, they should perform fairly similar, but the 29 will provide a bit more power and also spool a bit slower, but shouldn't be a noticeable difference. That's the give and take with more weight and larger surface area, you get more volume pushed and pushing, but you also generate more drag and have to move more mass. All in all, you should be good so long as the housings fit right.
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