What do you mean by 'P & S' ? Pending and Sold? Homes are compared for many reasons. Are you referring to an appraisal, a comparative market analysis or broker price opinion? Maybe a tax appraisal? Or lender appraisal? An insurance appraisal? When a home is unique in its' immediate area, we do sometimes use homes in other neighborhoods as comparables if they are similar in some way to the subject property. More details about your question would help me know how to answer.