Ports assets from the original 1.14 texture update snapshots (ex. 18w43a) to new versions
The nether is overall a tiny bit smoother
Andesite, Diorite, Granite, and Gravel all look different
The Bell has wooden legs, planks are more contrast-y, Cobblestone has a different pattern, and Wheat is much yellower.
Sand and Sandstone look very different. While not closely shown, their Red variants share similar changes
Ores/blocks are somewhere between 1.13-1.17 in art style at this point.
The Campfire is completely different in this version. The inside of logs are slightly different, too.