We all must keep in mind that computers do not control most of the whisky making processes in Scotland, but only lend a hand.
The human touch is ever-present.
Batch differences of course depend on scores of things, but the true crafting of the whisky run is controlled by the stillman. One stillmen may heart-cut his run different from an associate stillman even though they have procedures to run by.
There may be others but the only distillery that I know of that uses computers solely in the whisky making process is Glenburgie.
The only "computer" at Springbank is a chalkboard.
Batches DO differ as a result of the human touch. And that's a good thing.
The human touch is what gives us all some of the one-off fabulous whiskies that shine above all others. Batch differences can be a good thing.
As Glenfiddich has been used in previous postings as an example, I find that the complexities in Glenfiddich whiskies improve with age and that their young whiskies leave a lot to be desired. This could be the reverse with other distilleries.