The guidelines mention the day that the conditional resident status was acquired.. won't that be the the date- residence since "M/D/YY" on the green-card itself?
In other words would it matter if one card was delivered via the USPS on a later date than the other if both cards have the same - residence since date.
"If you have dependent
children who acquired conditional resident status on the same day as you or within 90 days thereafter, then include the
names and Alien Registration Numbers (A-Numbers) of these children in Part 5."