off by an inch is a bit much I agree. I used to swap signed quilt blocks all around the world long ago, before postage went up too much. Such fun and lovely quilts to be made up. Loved doing that.
and i've won a whole quilt of blocks in forums since then. twice at least. Two lovely quilts. all matched in size too.
we must learn what a 1/4 inch seam is and precise cutting and go from there. Until that is done, no swapping.
keep on trying though. it really is fun.