Years ago I fabrid for a quilt and a long time passed before I actually started turning it into a quilt.
When I started working on it, I realized that I did not have enough fabriic and could not find the fabric anywhere. So, I set the quilt aside. As luck would have it, 11 years later, I saw that fabric in a quilt store. So, I bought some. It was the exact same fabric, but the background color was a shade darker. I used it anyhow and dispersed the fabric around the top. When I finished the quilt and stepped back and looked at it, I loved how the slight change in color added more motion to it and gave it more life. I not longer feel that I need an exact match and close enough is not a bad thing.
I think it is very rare that fabrics are produed a second time and I was probably just lucky, However, I'm not any longer an exact color but avoid colors that clash and consider those that will blend in sort of well.