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First, I'm not sure it's a good idea to try and communicate between two different versions of ROS. That could lead to some problems.

Second, have you configured the network properly? Try taking a look here. The general idea is that you choose a PC to be your "master". On this machine, before starting roscore or a roslaunch, you must perform (where MASTER_IP is the IP address of your "master" computer):

export ROS_MASTER_URI=http://MASTER_IP:11311
export ROS_IP=MASTER_IP

On your second machine, you perform the following (where SLAVE_IP is the IP address of the second machine):

export ROS_MASTER_URI=http://MASTER_IP:11311
export ROS_IP=SLAVE_IP

You must do this in every terminal that you use.