Yeah, that's not the groove I thought you were talking about.

You really should look and see where the new seal rides. Seals are not all created equal and the seal that made that groove may not have the seal contact point in exactly the same spot as the new seal.

Take a small scale and measure the depth from the stop/ledge on the crank to the highest spot on the new seal, then measure the back edge of the sleeve on the balancer to the groove. If they're in different spots, don't fret about it. Also, the picture was not very clear so it's not clear how deep that groove is. Seals do have a fairly significant collapse to them, and it's very possible it will never leak. And if it does you still have the option of pulling it again and pressing the sleeve over it.