Default D800 radio in D801 phone?

I just switched service from Tmobile to ATT. I seem to be having difficulty bouncing between LTE and 3G on the ATT service and wonder if I can safely flash a radio file from the D800 to my D801? I'm currently running the latest 4.4.2 Mahdi rom with Tmobile patch and wonder if that radio file might be an issue?

Thanks