Yes, however certain features in the A radios will not be available if the original non-A connector is used. The A radios do accommodate a different connector than the original non-A radios as the A radios include additional features. The A radio's bottom connector has a notch in it so that it can accommodate the smaller, original non-A connector. Therefore, when replacing a KX-155 or KX-165 with a KX-155A or KX-165A, most major features will remain the same with the exception of the additional features available when using the A connector. Most significantly, the bezel backlighting feature available on the A radios will not be functional when doing this slide-in replacement using the original non-A connector. Both units utilize the same mounting rack (P/N 047-04874-0001).