You can glue baste the seams to a perfect match then sew. If the seams are off to much to distort the piece then it will be something you will have to correct in your sewing. There is a 1/4" wide double sided wash away tape that is excellent to get the perfect 1/4" seam on very stubborn blocks. It's called Magic Tape and found at most craft stores.
Quilt pros use shortcuts and unconventional items to achieve perfectly constructed quilts and they don't tell all of them!