Kesla can not be the same creature as Redjac because Denab is on the other side of Earth, 1600 light years away. Even Rigel is 770 ly's. Gives a rought travel of 2370 Light Years.
the redjac entity is non-corporal and does not seem to have a limited liefespan, so it's well possible. besides, it was stated in the episode. --BlueMars 23:39, Aug 22, 2004 (CEST)
In 2293, the location of Deneb in the Milky Way Galaxy was labeled in a star chart that was in Captain James T. Kirk's quarters aboard the USS Enterprise-A. (Star Trek VI: The Undiscovered Country, production art)