CL-65 First Officer reported when throttles were advanced right engine did not spool up in line with left engine. Rejected takeoff and taxied back to FBO.

Narrative

An aborted takeoff was performed as we took the runway. I was the pilot flying at the time. As we lined up on runway XX; and were cleared for takeoff; I continued my normal procedures as usual. When the captain handed me the flight controls; I acknowledged the flight controls and began to increase thrust on both engines to take off power. Within moments; I noticed the left engine N1 had increased to around 60%; where the right engine N1 was displaying 30%. The right engine was not spooling up; and since we were at a slow speed; I acknowledged it and told the captain. We called for an aborted takeoff on the runway due to engine abnormality; and safely exited the runway at the next intersection. After completing the aborted takeoff checklist; we requested to run some tests in the runup area to see if the problem persisted. Once at the runup area; we increased both thrust levers and the right engine was still not spooling up to takeoff thrust. We taxi back to the FBO; grounded the airplane and wrote it up. Maintenance is looking at the plane.