Redstone Comparator/Asset history

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Yellow	The block was introduced in this version.
Green	The block's texture was changed in this version.
Blue	The block's model was changed in this version.
Purple	The block's texture and model were both changed in this version.
Orange	Another visual change was made to the block in this version which does not fit in any of the above categories.
Red	The block was either removed in this version, no longer exists, or did not yet exist.
Cases where the model did not change are represented by cells spanning multiple rows. Cases where the model did change, but the change is not visible via the default view angle, are given separate cells. Changes which are not externally visible are not given cells.

From version		Unpowered				Textures used		Further info
From version		North	East	South	West	Before	After	Further info
1.5	13w01a					-		Introduction
1.5	13w02a							Top texture changed, and side now uses a different texture.
1.8	14w25a					-	-	Torches are now subject to directional shading.
1.14	18w43a							Texture Update
1.21.2	24w33a					-	-	Lowest torch is raised to accommodate the powered version's glow.

From version		Unpowered, subtracting				Textures used		Further info
From version		North	East	South	West	Before	After	Further info
1.5	13w01a					-		Introduction
1.5	13w02a							Top texture changed, and side now uses a different texture.
1.8	14w25a					-	-	Torches are now subject to directional shading.
1.8	14w25b					-	-	The lowest torch is now shorter.
1.14	18w43a							Texture Update
1.21.2	24w33a							Lit redstone torches are now different.

From version		Powered				Textures used		Further info
From version		North	East	South	West	Before	After	Further info
1.5	13w01a					-		Introduction
1.5	13w02a							Top texture changed, and side now uses a different texture.
1.8	14w25a					-	-	Torches are now subject to directional shading.
1.14	18w43a							Texture Update
1.18	21w41a							The top texture has been changed.^[1]
1.21.2	24w33a							Lit redstone torches are now different.

From version		Powered, subtracting				Textures used		Further info
From version		North	East	South	West	Before	After	Further info
1.5	13w01a					-		Introduction
1.5	13w02a							Top texture changed, and side now uses a different texture.
1.8	14w25a					-	-	Torches are now subject to directional shading.
1.8	14w25b					-	-	The lowest torch is now shorter.
1.14	18w43a							Texture Update
1.18	21w41a							The top texture has been changed.^[1]
1.21.2	24w33a							Lit redstone torches are now different.

Sources