There may be a small difference in the "puff" factor (and that will probably be hard to tell after an additional wash or two), but yes you can! I think you can figure out an easy extra set of swirls to fit in with what you've already done.
When I was learning long arm quilting I took more than one yarn tied quilt from the thrift store, removed the yarn while keeping the edges finished/with binding and practiced. I only did a couple of "utility quilts without enough quilting". They came out fine and worked great for warmth while we had the quilting eating dog...