User blog comment:ReverseZoom101/Season 4 Thoughts/@comment-27700324-20170822054854/@comment-27700324-20170824155409

That is different because Harrison Wells changed the device Eobard used to enhance his speed.

Also yes it was yellow, but sometime in his time as the Reverse Flash, he changed the color by enhancing his speed. We know this because he instantly knows where to go for a tachyon device. Almost like he did it before in his time.