CDV of Federal Soldier with Amputated Right Leg Leaning on Crutch Huntingdon, PA

CDV of Federal Soldier with Amputated Right Leg Leaning on Crutch with Huntingdon, PA Backmark!
There is a chance this could be two either
DUFFY, John PPrivate28th Regiment, Company O  from Huntingdon with loss of leg, at Antietam, Sept. 17, 1862--tr. to company B, 147th reg. P.V., Oct. 28, 1862
Or
DAVIS, James WPrivate28th Regiment, Company O from Huntingdon Wd., with loss of leg, at Antietam, Sept. 17, 1862--tr. to company B, 147th reg. P.V., Oct. 28, 1862
Both were from Huntingdon and lost their right leg leading me to believe this photo is very likely one or the other.