Bluetooth is a generic protocol with many "Profiles" that run in the application layer. For example, serial devices have the "Serial Profile" while Audio devices may be a HID (headset) or use A2DP.
You have to know what the device is programmed to act like to know how to use it.
Not all bluetooth devices are interchangeable because of their application specific profiles.
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Ahh, yes ofcourse. No i understand your question. Yes they are both for serial communication. I've managed to pair them to eachother but i need some example serial write/read code to uplode to both arduino's