GOSH...I am full of questions this morning...

Sure. Part of the DCC "standards" are that the components, such a decoders, be interchangable between brands. Sometimes special functions are not supported, but the loco should run. Fred
 
Bob,
To kind of echo what Fred said, an engine with a certain decoder installed, ie Digitrax, will not only run on another DCC system, such as Atlas, MRC, Lenz, etc. but will also still operate on a DC layout. You won't have contol of the lights or sound, (if equipped) but it will still work. In fact, the only concearns when selecting a decoder is does it have enough amps to run the loco you want to put it in, is there enough room inside the loco and do you want any special lighting effects or sound.

2slim
 
There are other concerns.

One is the programming. You can turn of DC support, and not all DCC systems support 4 digit addresses, so if you have a loco with a 4 digit address and DC turned off, it won't work on a DC layout or a 2 digit DCC system like the MRC Prodigy.

Of course, on the DCC layout, you can always reporgram the loco.