All in One PCB

Just a question, a lot of parts like the tiny resistors are not in stock. Can we add normal resistors in the trough hole’s? or do we really need them?

I have a lot of spare parts for PCBV2, but can i use them in this board?

  • 4n33
  • Cytron board (Dont know why the TLC081IP and the CNY172M are for)