Different Obsidian and Netherrack Blocks

Netherrack fence

- can turn into a Flame fence Netherrack button or pressure plate (See Damage Fences: https://feedback.minecraft.net/hc/en-us/community/posts/4409396304525-Damage-fences )

- 1 second long Red Stone signal

Netherrack stairs and slabs

- Decorative; these just blend in with other Netherrack surfaces

Netherrack door, gate, trapdoor

- The door/gate automatically closes a 1/2 second after you open it, as if it was on a spring.

- In Hard mode Zombies can break a Netherrack door.

Obsidian fence

- Decorative; these just blend in with other Obsidian surfaces

Obsidian button or pressure plate

- 2 second (really) long Red Stone signal, because Obsidian is really heavy

- Dropping any item on the pressure plate activates it, since it’s so heavy it easily activated.

Obsidian stairs and slabs

- Decorative; these just blend in with other Obsidian surfaces

Obsidian door, gate, trapdoor

- Can only be opened by an Obsidian pressure plate or button

Thank you for reading this very long post. :-)