The only punch I teach that is essentially different is the phoenix eye, the various angles in my mind do not make a punch different, the knowledge of punching from the variety of directions is important but to me that is more the understanding of application rather than defining a separate entity.
1. chair kuen = pulling vertical punch
2. chaap kuen = low punch
3. ngoi faan kuen = inside whip punch
4. hoi faan kuen = outside whip punch
5. doi gok kuen = diagonal punch
6. chour kuen = hammerfist
7. joong-lo kuen = drilling punch
8. tai kuen = raising punch
3 sounds to me like innergate punching, 4 outergate, 6 I personally have never thought of as a Wing Chun punch and 8 simply punching when the hand is low down which I teach from the ending of Chum Kiu.
My basic punch changes and develops with the increase of understanding the different energies that are available from the forms, simple arm/shoulder in Siu Lim Tau, turning using leg, hip and waist and back from Chum Kiu, from Biu Gee there are lifting and shoulder projection energies.
These energies when bolted onto the basic punch change the energy transfer but in essence do not change the mechanics of the punch at the point of contact, just make it more complex.
So why do I view the punch as the same when it looks so different, because it has grown from an infant to a fully functioning adult that has the ability to solve the problems it faces, not just respond with answers to questions it has already heard. Yet it is still called the same name.
Mr Punch lol.