I don't think I've seen it on a Sparkle Dun. However, I routinely do this with other emerger patterns that I intend to fish in the film.

I use a lot of Ross Mueller's Fuzzball emergers (a Snowshoe Hare wing emerger) and regularly tie them with PT or other material to match the nymph color and thorax material to match the dun color.

The Klinkhammer is another fly that seems to frequently be tied with a body to match the nymph and a thorax to match the dun.

Another emerger that's popular in my area is the Shillinglaw Emerger. This is usually fished through the water column (rather than strictly in the film), but it is also tied with different colors for the body and thorax. Here's a Shillinglaw Emerger I tied for our Light Hendrickson hatch that is similar in color scheme to the sparkle dun you posted.
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