dear sir
i have purchased bluetooth mate but my circuit works on bluesmirf gold can i use bluetooth mate .
Hardware-wise, their identical however the connector is wired up slightly different on the PCB.
Look at the schematics of each as you wire up you project:
The bluetooth mate fits nicely on the Arduino Pro and Pro mini, that is the only difference. Anything that works electrically on the bluesmirf will work on the bluetooth mate.