Hi pixator. Yes, the basic set-up of all the 1/64 scale cars is similar - apart from the old Matchbox Powertrack cars and the various lane-charger cars like TCR.
However... to run on Micro Scalextric track you will need to spend some time fettling the other makes, especially anything that has traction magnets - which is most cars since the 1980s. The reason for this is that the rails on Micro Scalextric track sit higher than other brands of 1/64 scale track. That means the traction magnets feel much more grippy and the cars need more power to move. It can make them very difficult to drive and can make the motors burn out.
The best option to help the other makes of cars work better on Micro Scalextric track is to run them with 'taller' rear tyres. This raises the traction magnets higher off the rails and reduces the downforce. Replacement tyres are usually available from most stockists who sell the other 1/64 makes and they should be able to help you.
All in all, I'd say the best cars to run on Micro Scalextric track are the Micro Scalextric cars.