Yup, the only difference was the gun bulges. The tail and canopy were identical to the early production G6s. Other than the bulges, the only way to tell the difference is usually the paintjob. A really high demarcation line and the squiggly paintjob shown above are usually good indications that the aircraft is a Ga6.
My records show that 150+ 109s were built at Brasov, but that may include the locally built G2s as well as the Ga6s. They were operated until around 1950-51 when all remaining WWII era aircraft were replaced by post-war Las, Yaks and MiGs.