The Panzer II was only used from '41 to '42. A year is pretty large, most of the maps in RO are in '44-'45.
Panzer II was used for the rest of the war after 1942 as a reconnaissance and infantry support tank.
Majority was removed from frontline service in 1942 but remained as an active part of Panzertruppen until 1943. Some Panzerkampfwagen II tanks were still in service during the Normandy Battles of 1944 and even in 1945 (145 as of March of 1945).
It was even manufactured until January of 1944. Albeit to a limited extent.