Really just pay attention to what your code is doing with A5 and D2 pins when you have a 328 in the ZIFF socket. A5 is connected directly to VCC and D2 directly to GND. This is done so that if you plug in an ATTINY85 instead, it will get power. The rest of the connections are just programming lines sent to the proper place for both 328 and 85 programming; no danger there. The area of the schematic labeled “ZIFF socket” maps that out.
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