An ICTBlockState object represents a block's current state.

It might be required for you to import the package if you encounter any issues, so better be safe than sorry and add the import.
import mods.contenttweaker.BlockState;

You can get an ICTBlockState either as a parameter in an IBlockAction function or from the Block Bracket Handler

<block:minecraft:dirt>

ZenMethod	ZenGetter	Return Type	Description
ZenMethod getBlock()	ZenGetter block	Return Type IBlock	Description Returns the refered block
ZenMethod getMeta()	ZenGetter meta	Return Type int	Description Returns the refered block's metadata
ZenMethod canProvidePower()	ZenGetter ​	Return Type boolean	Description Returns if the refered block can provide Redstone Power
ZenMethod getMobilityFlag()	ZenGetter ​	Return Type PushReaction	Description Returns the push reaction flag

boolean isReplaceable(IWorld world, IBlockPos pos);
Parameters:

• IWorld world → The world to be checked in
• IBlockPos pos → The Block's position

Returns a boolean that sais whether the block can be replaced or not.

int getLightValue(IWorld world, IBlockPos blockPos);
Parameters:

• IWorld world → The world to be checked in
• IBlockPos pos → The Block's position

Returns an int representing the current light value at the given location.

int getWeakPower(IWorld world, IBlockPos blockPos, Facing facing);
Parameters:

• IWorld world → The world to be checked in
• IBlockPos pos → The Block's position
• Facing facing → The side to be checked

Returns an int representing the current redstone power on this side.

int getComparatorInputOverride(IWorld world, IBlockPos blockPos);

Parameters:

• IWorld world → The world to be checked in
• IBlockPos pos → The Block's position

Returns an int representing the block's redstone comparator input override type.

You can either use int compare(ICTBlockState other); or the ZenCompare Tokens == !=.
The return different types though:

• state.compare(other) returns an int that is 0 if they are equal
• state == other returns a bool that is true of they are equal