Yes, you could adjust your Cost Basis on your 1099-B entry according to the sales schedule you received with the K-1.
The 8949 reports capital gain/loss, while your K-1 may report ordinary income as well, so there's some reporting from both documents used in your tax return. As long as you don't duplicate capital gain on 1099-B in K-1 section, you should be fine.
Everyone's situation is a bit different.
Here's more discussion on Reporting Both K-1 and 1099-B.
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