Identifying changes with only one field

Hi,

I am in need to find changes that happens with only one field. i.e. 

Data from Text file compared against SQL data. All the fields are looked up for finding even single changes with any of the fields.

But for a case, if a particular filed is alone changed and the rest remains the same, then i need to neglect that change as change.

How can this be done in SSIS?

Now i am doing, Flat File Source --> Lookup (SQL data) --> joining all fields.

Text file

Field1 | Field2 | Field3 | Field4 

1------| --1 -----|--3-----|--3----

SQL file

Field1 | Field2 | Field3 | Field4 

2------| --1 -----|--3-----|--4----

Here Changes to field4 is acceptable with the changes in Field1.but,

Text file

Field1 | Field2 | Field3 | Field4 

1------| --1 -----|--3-----|--3----

SQL file

Field1 | Field2 | Field3 | Field4 

2------| --1 -----|--3-----|--3----

Here in the above the change to Field1 is not acceptable, so need to show up as no change, though this column value alone changes without any changes with other fields.

Please let me know how to handle this? 

Which transformation can help me in this case or what i need to do ?

Thanks,

--------------------------- Radhai Krish | Golden Age is no more far | --------------------------