The second image that came with the ambro appears to be Bennett also but later on in the war. It's mounted on a later board.
This image has staining and wear but a nice companion piece to the ambro. The item "6th plate ambrotype armed civil war soldier identified taken in photo wagon" is in sale since Friday, January 06, 2017. This item is in the category "Collectibles\Photographic Images\Vintage & Antique (Pre-1940)\Ambrotypes". The seller is "40deadmenphotography" and is located in Dearborn Heights, Michigan. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, ZA, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, SG, to Switzerland, NO, SA, AE, QA, KW, BH, HR, MY, BR, CL, CO, CR, PA, TT, GT, HN, JM.