According to Law 1 of the IFAB Laws of the Game, the field size can vary dramatically. It's possible that MLS fields are actually smaller, a tactic that would seem to encourage faster and more intense gameplay. It's also possible that the players are beefier and thus the field looks smaller.
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It is possible. The Laws of the Game describe a wide range for the size of the field. While all proper soccer fields will fall in this range, some will necessarily be bigger than others, even within the same league.
Typically, no. Both fields fall within the range outlines by FIFA: between 100 and 130 yards long and 50 to 100 yards wide, with international matches having fields between 110 and 120 yards long and 70 to 80 yards wide. The size of different fields, even within leagues individually, will vary within these guidelines. However, all of them will be within the ranges given.
Technically, no. A soccer field is supposed to be approximately 75x120 yds, which is the size of most of the TV fields. Most youth and high school soccer fields are around 70x110 yds.