"World War II was won with British brains, American brawn, and Russian blood." ~ Attributed to Joseph Stalin
[Sound Warning: The links in this answer lead to unusually loud noise and music in the form of YouTube videos. This warning is for anyone in a situation sensitive to loud sound, such as wearing headphones or being at work.]
The soundtracks found in Company of Heroes 2 are quite similar to the soundtracks of World War II films.
This is the direct answer to your question: To find music similar to what the OP supplied, simply research the soundtracks of World War II films.
The aforementioned soundtrack seems to be inspired by British World War II films that focused on the nation of Britain. The themes center around the survival of Britain and the "glory of the nation." Britain was not overthrown and survived, and thus this results in generic victory music.
This is reflected in the film Battle of Britain (1969 film).
The Germans' theme in Company of Heroes 2 had more "gloom and doom" because German-centered films focused on the destruction of Nazi Germany, overthrow of Adolf Hitler, and militaristic themes. Simply put: Nazi Germany lost the war, and the music mirrors this.
This is reflected in Downfall (2004 film).
Schindler's List also has similar soundtrack.
The Soviets share the same theme and Nazi Germany, but there are other pieces of music that are inspired by the Soviet Union in the game.
The piece, "O My Brother, Be Strong", is from the game, and this reflects the mood of the Soviet Union on the Eastern Front.
While the Soviet Union won the war, there was a great loss of life. The emphasis was on the corruption of the Soviet leaders, mass loss of life, self-sacrifice, pain and suffering, and yes, also victory and triumph.
I'm not familiar with World War II films covering the Eastern Front and the Soviet Union; and Russian music.
The American theme focused much more on struggles and heroism surrounding a small band of soldiers, sacrifice, and small-scale heroism.
This is inspired by the themes of movies such as Saving Private Ryan and series such as Band of Brothers (miniseries).
This is a possible link of the title "Company of Heroes" to World War II films.
I'll close this piece of writing with a clip from Band of Brothers:--
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