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It's the same board but the one on my V3 I just pulled off is V1.05 not V1.03 I don't see why it wouldn't work though.

They were in the EZ-Robot shop at one stage


Although if you are changing it, it may pay to upgrade it to a better class of BT module for greater distance. Robot Doc has done the upgrade and will know what to use for that.
Thanks Rich
Just noticed the one I queried is bluetooth ver 2
as I use ver 1 dongle on one pc best to stay with that
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Just to throw all the details out there, since I have the mdule off the board at the moment.

It's a JY-MCU BT_Board V1.05 4 pin bluetooth ttl module
Thanks for the mention Rich. The Class 1 Bluetooth that has 6 pins of which the center 4 will mate up with the EZB(V3) can be ordered from Sparkfun.com Here is the URL Link

You will also need to order a male header strip so that you can solder it to the 4 center pin connections. Then you can plug it directly into your EZB(V3)

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Thanks Robot-doc & Rich
Would like to use class 1 Bluetooth but in this case it will have to be the cheaper option