No, the front ones are the same as in the Outback. There would not be any improvements on the change. I am not sure you can do that to a 2019 because in 2020 they changed the frame system in the Legacy and outback to be the same frame or base. the difference is they put a 2" left on the outback.
Here is great information on the changes. https://www.autoblog.com/2020/04/01/2020-subaru-outback-suspension-deep-dive/