Sorry, not sure what you mean. The power pins for both the SC-1 original and SC-1mk2 are the same for both (from left to right):
+48V -- V+ -- GND -- V-
They're both the same. You can see the silkscreen labels on the PCB.
I should have spelt this out more explicitly, sorry, my fault.
Owners of SC-2's need never think about or do what I did to get headers on SC-1's. And yes, wrong wiring of the power pins will lead to premature death of the pre. That's an experiment I don't ever intend on conducting.
Essentially, the audio pins aren't symmetrical and compatible because I've hacked up my own "special" connector, as the old SC-1's don't take standard headers without getting creative. On my set the audio pins can't correctly clip on both, as the "connector tab" is on the wrong/opposing side. That is, they clip together inversely. So 1-2-3 | --> | 3-2-1 when used on the different make. Which is wrong!
I ask about the flow of the wiring, as a friend suggested that I should just bunch all the power cables together and feed them from left to right, then to the power (I have an older 1848 supply). Then keep the audio wires as far away as possible from any power component. The old 1848 isn't so neat however, in that there's not multiple tabs to plug into.
I thought I might ask about wiring schemes, as it seems there are a few different ideas about - I think I saw some different ideas on this forum a while ago. Ultimately I guess I'm looking for some wisdom as you've been building these longer and more often than I have (and probably spent hundreds more hours building these than me too! Picking up useful building tips as you go too I imagine...