no worries... like i said, no guarentee on how close they are to the processors in those two machines. Need someone better than I to tell you that... Another idea is to check the older charts... those processors might be outdated.
recording machine activity, processing large files (trim / analyze data), network scanning
This might be a problem. Anything will do the first things you listed. Depending on the processing requirements of each of these items.
A quad core would be better. However, I think thats an older chipset. Whilst it competes with the i3, it still heading towards the "antiquitated" pile. If this is a worth machine, it might be worth while considering something a little stronger. It'll cost more, but it might give you an advantage. Also, you can always write it off on tax.