Germany with post-Munich borders, it's going to be different, in OTL capitalistic Germany major industrial areas was reduced to the Ruhr, here they have Silesia, Saxony and Sudetenland all three major industrial areas. population-wise we see three increases the 8 million Germans not killed, 2 million Germans, Czechs and Poles extra inside Germany plus 7-8 Austrians. While people may argue we won't see the post-war babyboom, I disagree, first there are more Germans (especially young men), second more or less all Germans neighbour with the exception of France, Austria and Belgian Wallonia saw a major population boom after the war. So at very least I'm going to guess on a population of 105-120 million by modern day.
Economic Saxony, Thuringia, Saxe-Anhalt , Silesia and Sudentland are going to follow the development of Nordrhine-Westphalen, Rhineland-Pfalz and Hesse. Austria are going to be a Bavaria and Baden-Württemberg extra, while Mecklenburg, Pommern, Neumark and East Prussia are going to end up much like Niedersachsen and Holstein.
Brandenburg are going to end up as greater Berlin. Without OTL split Berlin will continue its growth for decades. Most European capital have around 10% of their country's population, this will transform Berlin into a metropol the size of London.
Economic we are not going to see EU or EEC, but still Germany need food, raw materials and markets. It will likely not look to France or UK which have their own industry and empires to serve as markets. So instead it will be cventre for a internal Central European market, Benelux, Italy, Czechslovakia, Hungary, Denmark, Sweden, Finland, Balticum and the Balkans will be the main trading partners of Germany. Poland will likely join the German trade network too. This may enable these countries to repeat the economic growth and integration of EEC, through it will never get as close as EU (at least not by 2010).
The guestworker pattern will change too, where Germany in OTL saw Turks, Yugoslavs and Italians, Poles and Hungarians will likely be highest on the list here of guest workers here.