Just seen all this, Quick skim read but confused as to what the actual confusion is >.<
4 pins are either 3 phase and earth or neutral, 90% of the time it'll be a neutral cause earth is not needed if double insulated cable or it is earthed from a different source. 5 pin is obviously 3 phase, neutral and earth.
4 pins, 3 pins, 5 pins all come as 16, 32 or as big as 60+ just depends on the rating etc.
Generally the blue will stand for 16, red 32 and if it is a 4 pin it'll be a 16a, 5 pin it's 32a. Just typing a lot now hope it helps sorry if I'm just completely off the question >.<
Can also tell by cable size which it'll be as 2.5 cable can only stand 20a max and 4mm cable can do 35~ roughly but as I said I'm not too sure what the confusion is