The 4TX has a 17/42 ratio for years 96-98 and 16/43 for years 99-01.
The gearbox ratios are different too, only the primary ratio is the same.
There is a wasted spark on the 4TX because there is no sensor on the camshaft which could allow the TCI (not a CDI !) to differentiate between TDC compression and TDC exhaust.
The crankshaft sensor is a variable reluctance sensor : it detects teeth on the rotor. On the 4TX there is only one tooth that extends to 90° of the rotor : the TCI gets the raising edge of the tooth to send a spark on one cylinder, and the falling edge for the other cylinder, which is ok for a 270° engine : 90 + 270 = 360 = 720 / 2.
Btw the rotor teeth are not magnets, they are plain metal. The pickup coil already has a magnet inside its body and detect any metallic part moving within its range which modifies the magnetic field.
The 5PS is different, there is a camshaft sensor which allows the ECU to get the exact engine rotation info around the 720° cycle and avoid having a "wasted injection pulse" and also a wasted spark at the same time.
The 5PS has 12 teeth on the rotor. Better timing for the ECU, but don't forget an ECU is a complete engine management system with a digital computer and an embedded TCI. That mean among many other thing that the computing power of the 5PS ECU is way above the 4TX simple TCI.