The bearing should not have much thermal lag to reach temperature. Alignment can gradually increase temperature (or decrease). Bearing load (factors such as alignment affect this) can cause a temperature increase. Are the oil supply temperatures the same?
Did the old bearing have any damage? This bearing didn't do much if anything - What tells you the old bearing was bad? You are talking bearing metal temperature and not oil temperature? Does the oil cooler keep the oil supply the same as the other machines? Are all oil viscosities the same? Are the bearings the same type (meaning geometry of the bearing)?
The bearing does have to be aligned with the journal. Are assembly clearances the same?
I cant convince our Maintenance Manager to perform the scraping (due the vendor telling him it wasn't "necessary because nobody scrapes bearings anymore") if for nothing at all but to rule it out as a possible source of the heating.
It is really difficult to un-scrape if the temperatures go up after scraping.