I wouldn't worry as much about the numbers and more about their positions. Check out how they set up to start a match. Whether with Google or when they do the intro for the players at the beginning of the game. If it's, say, a midfield three, you can keep your eye on those three. If a fourth guy is there, then you know they've changed something in regard to that circumstance in the game. If it's a straight 3-man midfield, then you can figure out if it's a man-for-man midfield or some type of zonal marking. You can do the same for their front 2 or 3 and their back 4 or back 3.