Comparing the list item values from 2 lists and update the matching items to 3rd list

Hi,

My requirement is:

i have 2 lists one is profile picker and another one is information.

both the list has same fields like region, importance (managed metadata columns).

i need to compare the matching values between 2 lists.

in the profile picker list, if the 2 field values are matches with the information list item then i need to update the title value of information list to the third list.

what is the best way to do this?

Aruna