Carrera digital chip in other brand cars???

Has anyone tried this?? I would think that due to the fact that all cars run on a DC system and motors are pretty compatible to different brands, so in theory you should be able to with no big issues. I have just purchased a wireless controllers, and a black box for my Carrera track, and wanna be able to convert my analog cars while using digital, and have sold all my Carrera cars and run Scalectrix, Slot It, Fly and MMRC cars. So has anyone done something like this??? Any help would be appreciated, I'm pretty good with DC electric principles as I build electric coil type tattoo machines from scratch, so I need advice before trial and error... Thanks much...