How does AMENDED 1-140 application differ ??

It is required when either your company name changes, is merged with some other company etc..

 
 
My question is

How does INS know that this is AMENDED I-140 application and not NEW I-140 application
 
I did not find form for AMENDED I-140

I did not find form for AMENDED I-140 on INS or other immigration sites.
 
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