Mixing E32 modules 433T30D with 400T20S

Hi Guys Can you get different E32 modules to talk together? I built the SMD converter board so that I can use the SMD version 400T20S They _seem_ to have the same command codes, but I can get a 433T30D to communicate with another 433T30D and a 400T20S with another 400T20S But I cant get a 400T20S communicating with a 433T30D Any ideas?