The best indication that Luke and Caedus have comparable TK is feat of holding b-wing in place.
"He grabbed the vessel in the Force and held it in place, then opened fire with his laser cannons. The startled B-wing pilot applied more power, trying to break free. Luke drew on the Force more heavily to counter the maneuvering thrusters, and all of the energy flowing through his body began to make his skin nettle.
...
Luke started to Force-grab the fighter again, but Jacen had already caught it and was holding it in place while cannon bolts pounded its shields from above."
Holding b-wing made Luke's skin nettle, here is why:
"During the past year, he and Jacen had been had been working on overload techniques , so he know could endure the pain and fatigue almost indefinitely. His body would pay a steep price, aging a year in a matter of minutes, but he knew he would not collapse"
Based on that it can be concluded that holding b-wing during flight in space took tremendous effort that required Luke to use that overloading technique. Yet, Jacen had no problem replicating it as well and that's before he became more powerful as Caedus.