Hi Gnow
Are both engines passing the engine power check? If so, then there is no problem and you will get the required OEI performance. In my experience, the TOTs are normally fairly close. I don't think I have seen more than 20degrees difference. You will get a DIFF PWR warning if the TOT difference reaches 80degrees bit I am sure the EPC would flag up an out of spec engine before that.
I suspect the maintenance manual may have a figure above which maintenance action is required but as a mere pilot I have no knowledge of it.