That happens to me a lot on this one quilt that I'm making. There is very little difference and it is only under an ott light that I can tell which side is the right side. If your quilt is like that, I wouldn't let it bother me.
If it is, I like the idea (if possible) of quilting it so that no-one will notice.
laughing at myself...when I made the flying geese block on the URR, I goofed at the last minute and ended up having the geese in one part of the block flying out of the block instead of around the block. (That is not the way it is suppose to go.)
I realized this after the whole block was put together and I had trimmed the block. Looking at the block, I started laughing...since the block made me laugh I decided not to change it. From here on out, I will look at that quilt and laugh... You can't beat that.