Yes, it's the same Wolfgang Semmer. Born in 24.02.1917, he reached the rank of Major and was executetd as a P.O.W. in Yugoslav captivity on 02.12.1949. Source is Veit Scherzer; "Ritterkreuzträger 1939-1945" (2005) and Herr Scherzer comments that he was "in jugoslawischer Kriegsgefangenschaft ermordet". This could indicate that he wasn't really tried in a Yugoslav Court of Law (at least not correctly tried), as Scherzer, being a very methodical and meticilous researcher, uses the "murdered".
"Wie es eigentlich gewesen ist"
Leopold von Ranke (1795-1886)