An approved custom label is tied to the product, size, and grind you assigned when you paid the review.
You cannot attach that same approval to a different coffee, size, or grind. Upload again, assign the new SKU, and pay the $2.75 review. Change net weight and the statement of identity so they match the new SKU.
If you only need a small art tweak on the same SKU, upload a replacement for that custom product. It is a new review.