How to calculate component value of a matching network
If you have exactly the same PCB and setup as shown in the datasheet, you can use the same tuning components. But this is unlikely. 

Often you have tiny differences. In that case you need to measure the impedance of the antenna e.g. with a vector network analyzer (VNA). 

Then you can tune the antenna with e.g. the smith chart. The topology (pi or T network) does not matter. 

Practical advice: If you do no tuning, i.e. you just connect the antenna with a 0E resistor, you often get good performance. Tuning is required for highest performance