There are 3 rows which are different as per the sample data provided

UPDATEOD

SETOD.FirstName = UD.FirstName,

OD.LastName = UD.LastName,

OD.Birthdate = UD.Birthdate,

OD.AreaCode = UD.AreaCode,

OD.PhoneNumber = UD.PhoneNumber

FROM#OriginalData AS OD

INNER JOIN #UpdatedData AS UD

ONOD.MemberID = UD.MemberID AND OD.LocationID = UD.LocationID

WHEREOD.FirstName != UD.FirstName

OROD.LastName != UD.LastName

OROD.Birthdate != UD.Birthdate

OROD.AreaCode != UD.AreaCode

OROD.PhoneNumber != UD.PhoneNumber