>>150100314 (OP)
Not necessity, it really depends on the players on the team and most of the time it's asymmetrical since having players who excel in the same skills on both sides of the pitch is rare. For example there's typically a side which is more attacking and a side that's more defensive. Like Trent on the right at Liverpool and Robertson on the left, similarly in Utd back in the day Evra on the left was more attacking than Neville/Brown on the right.
There are thought of as playing centrally who like to drift wide. Henry who was a striker (typically in a 442) was famous for picking up the ball on the left side and running towards goal rather than playing centrally like his position would typically dictate.
Players also don't typically keep a perfect formation, It's not really possible with the presence of the other team's players and besides its more natural to play with your teammates a bit staggered.
The real shape of a team isn't always the formation they line up in too. Like City typically line in a 433 but, they actually play with the midfielders forward and the fullbacks pushed up. 2008 united used to lineup in a flat 442 but, in practice they played this lopsided hybrid 433, 4231 with Ronaldo Swapping wings, Rooney dropping deep and the Gigges (if he was playing) tucking into central midfield. 2007 Ac milan would also lineup in a flat 442 (which was actually their defensive shape) but, in practice they played with a midfield diamond instead. So, most of the time, the formations you see on the internet and that the broadcaster puts up on the screen before the game isn't necessarily what the team will play