public IReportRow Compare(PageResponse origin, PageResponse target)
{
var unequalFields = new List <TagValue>();
var page1Attributes = origin.FindTagValues(_compareFields);
var page2Attributes = target.FindTagValues(_compareFields);
unequalFields.AddRange(page1Attributes.Except(page2Attributes, new TagValueComparer()));
return(new TagCompareResult(origin, unequalFields));
}