When we were in the market back in March, I spoke to Jayco about the differences between 14 & 15 for the 23B. You are correct, only differences were cosmetic, AC shroud, hot water tank side cover, and awning support arms went to black. At that time the price between ordering a 15 or finding a 14 at another dealer was only a couple hundred bucks for us, so we went with the 15. The 15s are on lots now, so you may find a good deal on a new 14 at this point in time.
2012 Chevy Silverado 3500 LTZ, Duramax