Yes, when you change the nozzle to a larger size it makes more power.
Not sure what your asking or trying to say. There is plenty of info here on nozzles and it is not something you want to do your self. It can be done but you need to have a diesel performance shop pop test and tune them for you. The go to on this is dark side developments and karma tdi. I have no clue about the Chinese market.
I'm running some aliexpress nozzles in my junk
they say they are ".30" but a .29mm pin gauge doesn't fit in there.
they do however shoot out similar amounts of fuel as my previous dss-r .360s based on smoke level alone, running them with an unchanged tune
oh, and 2 out of the 16 I bought were streaming, but I got a refund on 4 of them (as the two leftover good ones are worthless) so no real complaints on the needle seating surfaces. Only got about 3-4k miles on them running waste oil, so any long term info I get would be worthless anyways.
buying chinese is... interesting. There is no repercussions for screwing over foreigners. Even if you sue them on a six figure deal gone wrong, the company just declares bankruptcy and reopens under a different name same day.