Has this suddenly happened? Does one engine appear to warm-up quicker? Is the Delta-T consistent at all stages of flight? ? Pressures OK? What temperatures are indicated when the engines are cold?
If this was a Medical Forum we'd probably be advising you to talk to your GP/doctor/physician, not just other patients.. Talk it over with your Continued Airworthiness guy or Mechanic/Engineer; that won't cost you a penny. They can advise the most cost-effective troubleshooting if they are concerned about it; for instance transposing the indicators and/or the temp transmitters.