Generally speaking in regards to ECUs you must replace like for like. The only way I see the "392" working for you is if Subaru superseded the part number. You will want to contact a dealer with your VIN and see what they say. You don't have to buy, but they should be able to tell you which unit will work.
So I contacted the dealership, they were clueless and just wanted me to bring it to them. I purchased the 392 and it works like a champ!!!! Long story short the car rolled into a pond cause I didn’t pull the E brake hard enough.