Exactly as the title says. Would a German victory in WW1 (let's say between 1916 and 1919) have any effect on the population dynamics of Paris and Berlin? Would Berlin be a bigger city than Paris by the modern day (IOTL, the greater Paris area's population outnumbers greater Berlin's by a margin of 2 to 1)?
Let's assume that France, while seething in its revanchism, never musters the strength or allies to start a Second Great War against Germany (at least, not one as large-scale and devastating as the Second World War in our timeline). Even without the destructive potential an eventual second war could have, would instability and recession in France in the 1920s and 30s, coupled with an economic and national revival in Imperial Germany, be enough to tip the scales of population in Berlin's favor?