Hey Mithiriath,
Red Ball Express is designed to be a 3v3 map, 4v4s are supported but not necessarily recommended if you dont like 4v4 stalemates. Concerning the size:
The map size is pretty much the same, while the center of the map is a bit tighter (due to the two buildings you mentioned) and of course the forest to the right which was added to have one part of the map play differently.
Ok, thanks you for your explanation (Senseo1990 is also Grandmaster B, okk ^^). Maybe it's CoH 2 graphism (models size/environment) or camera height that let me think the map is smaller.
I would like to see in CoH 2 more exclusive number of players maps in automatch (and maps filter too). That is to say only 1v1, 2v2, 3v3 or 4v4 maps not maps which is for example 2v2 and 3v3.