How to adjust PAC size correctly?

I have troubles to settle correctly PAC size. Table 6 in user manual say to put it with 16 for 512 preamble length and with 32 for 1024 preamble length.
However, Decawave API say to put 32 for 512 preamble length and 64 for 1024 preamble length

So which value should I set for this both preamble length ?
Thank you for reply.