var obj1 = {
  key1: 1,
  key2: 'Value2',
  key3: 3,
  key4: 'Value4'
}

var obj2 = {
  key1: 1,
  key2: 'Value2',
  key3: 'Value3'
}

var someKeys = [
  'id', 'name', 'age', 'city'
];

function validateKeys(obj,someKeys) {  
    if (Object.keys(obj).length !== someKeys.length) {
    return false;
  }
    for (var i=0; i<someKeys; i++) {
      if (Object.keys(obj) !== someKeys[i]);     
      return false;
    }
  return true;
}

console.log(validateKeys(obj1,someKeys));
console.log(validateKeys(obj2,someKeys));