bobp1426,
Probably best if you read
https://www.uscfinvestments.com/k1-information
closely. The K-1 is like a 1099-DIV showing your share of gains/losses/etc. The 1099-B is for the sale itself, reporting the difference between your receipts and your cost. As that webpage indicates, the numbers on your K-1 do modify the cost basis to report with the 1099-B. You will have to determine of the 1099-B cost basis has already been adjusted. The USO prospectus goes into great detail on these topics starting at page 61 of https://www.uscfinvestments.com/documents/united-states-oil-fund-pro-20200612.pdf
Good luck.
