Hello! I'm a real novice and after watching a few videos, I'm just afraid of screwing up my board by plugging in the ethernet shield 2 since it works on 5v according to the specs,
Is there a compatible shield or is the 5v shield finally compatible? I'm looking for a shield that doesn't require soldering if possible
Thanks in advance for your help
The Ethernet Shield 2 is compatible with the Arduino Uno and Mega (using the Ethernet library).
Does this answer your question?
As mentionned in the title, I'm using an arduino DUE, which only tolerates 3.3V for the pins voltage. While the ethernet shield 2 requires 5V, is it supposed to work ?
PS: I think this one should work Arduino MKR ETH Shield — Arduino Official Store but would require to manual map the pins using extenders right?
I think the ethernet shield 2 is compatible with the Arduino Due. Your project should work!
Unfortunately I do not know it. 
Maybe this will help you further:
Ethernet shields causing DUE to output 5V from 3.3V pin - Hardware / Arduino Due - Arduino Forum
You are correct. The Ethernet shield 2 has circuitry that expects to be powered by 5v, and also expects the incoming SPI signals to be at the 5v level.
The MKR ETH shield should work in theory.
Normal SPI connectivity rules apply. You need to connect the MISO, MOSI, SCK, RST, 5v, GND and ETH_SS (slave select) pins Check the circuit diagram https://content.arduino.cc/assets/MKRETHShieldV2.0_sch.pdf
The shield generates it's own 3.3v supply from the Arduino 5v input rather than using the 3.3v supply directly.
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