Kurtl, there were B-26 operations in Austria during the war. The SAAF had 5 squadrons of B-26s, Here is a link about 24 Squadron which was operating from Iesi, Italy late in the war. They flew attacks against St Veit, near Innsbuck. In the link such an attack on 23 March 1945 is described.
http://www.aircrew-saltire.org/lib059.htm
So I guess you can't rule out a B-26. Where exactly (or even approximately) is the crash site. It might give us an idea how to proceed.