The variable blocks are color-coded orange, and the list blocks are color-coded dark red.
There are currently 15 Data blocks: 10 Stack blocks, 4 Reporter blocks, and 1 Boolean block. There are 5 Variables blocks and 10 List blocks.
Variable Blocks are used to hold values and strings in variables, as well as display them using monitors.
There are currently 5 Variables blocks: 4 Stack blocks and 1 Reporter block.
They are color-coded red and are used to manipulate lists.
There are currently 10 List Blocks: 6 Stack blocks, 3 Reporter blocks and 1 Boolean block in this category.
The above information is referenced from Scratch Wiki.