Could you describe your hardware setup in detail? As indicated in the video you mention, you still need a LocalTalk bridge (Mac with both EtherNet and LocalTalk or a dedicated device) to bridge your NeitherNet to Ethernet.
I mean does the SE/30 has its original ROM SIMM (or did you upgrade to a IIsi or Rominator II ROM). My SE/30 enters test mode only with the original ROM SIMM.
And it‘s clear this is a n/c pad since there is no trace to it.
Btw you seldom repair such a board by replacing chips. Broken fuses, traces, solder joints or leaking capacitors are much more common. Let‘s hope you didn‘t do more damage to it.
This pad (pin 5) is deliberately not connected, so there should be no difference. The part at L1 is an inductor (coiled wire) and most certainly not in need of replacment.
siliconinsider usually does a great job. I have 4x4MB SIMMs from him in my SE/30 which work great! The SE/30 however is very picky about RAM. Did you install them correctly? What are the symptoms?