Blight is a better Wraith
They're basically the same concept, but Blight is a better execution. An M1 Killer with high mobility to get around the map and find chases. The difference is that Wraith's power is literally just mobility, while Blight's is much more versatile because its mobility and helps in chases.
I bet in a speed run test Blight could see a Survivor on BBQ and zoom across the map to start a chase with them faster with Wraith could. If you really wanted to see the parallels, you could give Blight the add-on that makes him undetectable while rushing (Vigo's Jornal) than he'd literally just be better Wraith.