Biometrics Code identification for I-485 Application

Hi Every one,

Is there anyone aware of the code given by the USCIS while doing their biometrics?
Me and my wife has been given Code 3 while my 2 kids are given Code 2.
Does this really meaningful for the process of application? or why did USCIS made difference on these categories?

Thank you in advance.
Shyam Kumar
 
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