Here is the list of all changes that were made in whole existence of New Better Textures Resource Pack Legacy Edition

How does version numbering works for the NBTpack Legacy:
Is the update the one and only "release" update? -> major update   - 1.0 			- no title
Is the update a small update? 			 -> minor update   - last version +0.0.1.~0	- no additional minor titles
Is the update a bug fix / hotfix update? 	 -> fixer pack 	   - last version +0.0.0.1	- fixer pack; no additional minor titles
Is the update a very small update? 		 -> fixer pack 	   - last version +0.0.0.1	- updated; no additional minor titles

No other update types are to be expected for NBTpack Legacy

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Legacy 1.0

Block:
From 0.1
+Beds - mob pattern (pink, white, black, red, purple, yellow, brown)
+Concrete - changed texture
+Stained Glass - changed texture
+Beacon - added animation and changed texture
+Dragon Egg - changed texture
+Redstone Torch - changed completly
+Torch - changed wooden part to planks texture
+Bedrock - changed texture
+Structure Block - added animation
+Melon - changed texture
+Lever - changed texture
+Crafting - changed texture
+Enchanting - changed texture
+Hopper - added direction indicator
+Smooth Stone - changed texture
+End Rod - changed texture a bit
+Iron Door - changed texture
+Iron Trapdoor - changed texture
+Iron Bars - changed texture
+TNT - changed texture
+Red Mushroom - changed completly
+Frosted Ice - changed texture
+End Portal Frame - changed texture
+Prismarine Bricks - added animation
From 0.2
+Orange Glazed Terracotta - changed colors
+Beds - mob pattern (green, magenta, cyan, lime, green)
From 0.3.1.1
+Turtle Egg - changed color
From 0.4
+Shulker Boxes - changed texture
*Crafting - ???
From 1.3
+Prismarine - added 2 frames to animation
+Beds - mob pattern (orange, gray, light gray, blue)
From 1.4
+Glowstone - changed texture
+Furnace - added animation to lit Furnace
From 1.5.13

Items:
From 0.1
+Diamond Sword - changed texture
+Wooden Sword - changed texture
+Stone Sword - changed texture
+Golden Sword - changed texture
+Firework - changed completly
+Spider Eye - changed texture
+Turtle Shell - changed texture
+Kelp - changed texture
+Dried Kelp - changed completly
+Slimeball - changed texture
+Popped Chorus Friut - changed texture a bit
+Item Frame - changed texture
+Iron Door - changed texture
+Elytra - changed texture
+Empty Armor Slot Shield - changed completly
+Leather Boots - removed undyable texture
+Leather Helmet - removed undyable texture
+Leather Pants - removed undyable texture
From 0.2
+Heart of the Sea - texture
From 0.3.1.1
+Turtle Egg - changed color
From 0.4
+Conduit - added texture
From 1.5
*Leather Boots - changed shape
From 1.5.8
*Leather Tunic - changed shape
From 1.5.13
*Item Frame - updated texture
+Glow Item Frame - changed for consistency
+Prismarine Crystals - added prismarine block animation
+Prismarine Shard - added prismarine bricks animation
Legacy Exclusive
+Crossbow - changed firework for consistency
+Netherite Sword - changed for consistency
+TNT Minecart - changed for consistency

Entities:
From 0.1
+Vex - changed charged vex texture
+Zombie Villagers - changed textures
+Phantom - changed texture
+Drowned - changed texture
+Zombie - changed texture
+Iron Golem - changed texture a bit
+Ghast - changed texture
+Guardian - changed texture
+Elder Guardian - changed texture
+Cave Spider (glowing eyes breaks this) - changed texture
From 0.4
+Shulker - changed texture
From 1.3
*Zombie Villagers (Nitwit) - changed texture
From 1.5.13
+Armor Stand - changed slab
*Ghast - updated color palette

Effects:
From 0.1
+Speed - changed completly
+Invisibility - changed completly
+Water Breathing - changed completly
From 0.2
+Conduit Power - added shell around heart icon
From 1.4
+Mining Fatigue - changed completly

GUI:
From 0.1
+Beacon - changed tier colors
+Enchanting - changed item window
+Equipment - changed crafting window and hotbar
+Furnace - changed fuel window and arrow
+Brewing - changed brewing slots

Other:
From 0.1
+Leather Armor - removed undyable texture
+Beacon Beam - changed texture
+Elytra - changed texture
+Grass colormap - changed
+Story Advancements Background  - changed
+Adventure Advancements Background - changed
+Recipe Book - changed texture
+Armor Points - changed texture
+Connection status icons - changed colors
+Expierience bar - changed texture
+Horse jump strength bar - changed texture
From 0.3.1
+Background - changed to the first panorama

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Legacy 1.0.0.1r8a

Block:
*Prismarine - fixed

GUI:
*Brewing - fixed

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+ changed something for the first time
- changes removed
* changed after being added