Try this:
(1) Save the settings of the new one under a different name (just in case).
(2) Open client that has the old settings and load its most recent session.
(3) Connect the aids (click connect/detect)
(4) Once the software detects the new devices, it will recognize they are different from the ones in the saved session.
(5) You will get a mismatch error. You will be offered the option “Use session data” or “apply session data to hearing aids”
(6) Connexx will attempt to apply the session data to the aids. Not all settings/data may be transferred.
Please make sure you do step 1.