A picture would help, but I believe that they are the same boat. Parker tends to use the "'20" moniker for a standard length pilothouse, and "'30" for an extended cabin, which generally contains either a port side dinette/table and a stbd bench seat or port and starboard bench seats. However, their model numbers change around a bit from here to there- see the 3420, which was definitely "extended" in pretty much every way! Is yours marked as a 2320?
I believe they are the same boat but I bow to those more experienced. I think Parker originally named this boat the 2320EC, then later changed it to 2330 to be more consistent across their line. I wish they would bring the boat back in production.