Old vs New style labeling.
6CTA
6- 6 cylinders
C- C series engine(B,C,L,M,X are common ones)
T- Turbocharged
A- Aftercooled
Another Popular one is 6BT
6- 6 cylinders
B- B series engine
T- Turbocharged
The B series also came in a 4 cylinder version was subsequently called 4BT.
ISC is the new style labeling. It's essentially the same series engine with a few improvements and added computer control. IS stands for Interact System, while the last letter indicates the series.
You can also add the displacement after the the name if there is more then one in the same series, such as the case of ISB3.9, ISB5.9, and ISB 6.7.
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