It looks like you have a few options really.

If you have Bluetooth up and running on the tablets and pair them, then you should be able to "send" contacts directly. Just bring up the contact list on one tablet, select the contacts you want to send, and choose "Contact->Send...->Via Bluetooth" from the pulldown menu.

Or you can use "Tools->Export..." from the pulldown menu there. Then transfer the file to the other tablet and "Tools->Import..."