PMR446..GB-1R interaction

Hi, I recently bought a Midland GB1-R for a trip in a 4x4, a had a couple of older Motorola T82 Extreme, should I be able to communicate between these and the GB?
At the moment I can the receive T82 on the GB but when I transmit I get nothing on the T82.
Am I doing something wrong?

The frequency allocations are the same ones but choice of tones seems a bit random so no, no guarantees you can mix makes though usually at least one or two channels the same will be there somewhere if you are lucky