Can I add or remove values and variables in persistentDataPath once it's been created?

 public class SaveLoad : MonoBehaviour {
 
     public void Save()
     {
         BinaryFormatter bf = new BinaryFormatter ();
         FileStream file = File.Create (Application.persistentDataPath + "/playerInfoITH.dat");
 
         PlayerData data = new PlayerData();
         data.lang = Data.lang;
         data.music = Data.music;
 
         data.uwarriortest = Data.uwarriortest;
         data.uwarrior = Data.uwarrior;
         data.uarcher = Data.uarcher;
 
         data.coin = Data.coin;
 
         bf.Serialize (file, data);
         file.Close ();
     }
 
     public void Load()
     {
         if (File.Exists (Application.persistentDataPath + "/playerInfoITH.dat"))
         {
             BinaryFormatter bf = new BinaryFormatter ();
             FileStream file = File.Open (Application.persistentDataPath + "/playerInfoITH.dat", FileMode.Open);
             PlayerData data = (PlayerData)bf.Deserialize (file);
             file.Close ();
 
             Data.lang = data.lang;
             Data.music = data.music;
 
             Data.uwarriortest = data.uwarriortest;
             Data.uwarrior = data.uwarrior;
             Data.uarcher = data.uarcher;
 
             Data.coin = data.coin;
         }
     }
 
     public void Delete()
     {
         if (File.Exists (Application.persistentDataPath + "/playerInfoITH.dat"))
         {
             File.Delete (Application.persistentDataPath + "/playerInfoITH.dat");
         }
     }
 }
 
 [Serializable]
 class PlayerData
 {
     //Settings
     public int lang;
     public bool music;
 
     //Characters
     public bool uwarriortest;
     public bool uwarrior;
     public bool uarcher;
 
     public int coin;
 }

My question is whether I can add new variables or remove them to the PlayerData class when I update my application.

Example:

 class PlayerData
 {
     //Settings
     public int lang;
     public bool music;
 
     //Characters
     public bool uwarriortest;  //Can I remove it?
     public bool uwarrior;
     public bool uarcher;
     public bool uwizard;   // Can I add it?
 
     public int coin;
 }