Air taxi Captain reported a rejected takeoff when takeoff power was not matched on one of the two engines. After returning to the FBO and deplaning; the crew observed a bird strike in one of the engines which may have contributed to the degraded engine.

Narrative

We departed from ZZZ1 around XA:35 and were vectored around to go direct to ZZZZZ which is the FAF for RUNWAY XXR. We had a non eventfully trip landing at ZZZ approximately XB:01. We never had any indication of bird ingestion along our path. It was dark during this first leg of our mission of the day. We were due to depart at XC:00 and our passengers slowly started to arrive at the FBO. After loading our passengers and giving our safety briefing; we ran our checklists for engine start. We did not notice any abnormalities and had; 'two good starts'. We continued our checklists down to our final items before takeoff. I informed ZZZ tower that we were ready to depart. ZZZ tower cleared us to depart and we lined up in position and held the brakes for a static takeoff while setting takeoff power. Both engines spooled up nicely; but started to show a difference in power around 85% N1 with the left engine not developing the same thrust as the right. We informed the tower that we needed to cancel our takeoff clearance and taxi to the runup area. In the runup area; the PF spooled up the engines around 45% N1 and both throttles/ power were matched with no issues. We then informed tower we would be ready to depart. Tower issued another takeoff clearance and the PF smoothly applied power. Around 85% N1 power setting; the left engine would not develop the desired takeoff power and had a higher ITT (Interstage Turbine Temperature). We canceled our takeoff again and requested taxi to the FBO. Upon deplaning our passengers; we discovered bird blood/ matter around the inside of the intake and feathers behind the N1 fan blades. There was no damage the engine inlet or fan blades. We believe that we ingested a bird as the power was being set prior to brake release. Thank you.