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Hello Ms. King,
Thank you for contacting the History Hub regarding alias Civil War soldier names. Aliases were commonly used by many men across many wars. After a quick review of Google articles, I cannot ascertain any consensus on why the soldiers chose to serve under alias.
Regarding the two George Herrings mentioned above, I do not believe the two certificates are related. One soldier is from the Illinois Infantry and the other is the New Hampshire Infantry. Two separate pension certificates issued to each soldier.
Or, you may review Civil War records in person for free at Washington D.C. National Archives. You may make copies or take pictures of records that you request.
I hope this information is helpful. Best of luck with your research.