This is something ive been thinking about lately and wondering what things other people may have found.
Do you mean in terms of 1st print and later print runs?
I didn’t actively track this but I noticed some differences for some modern Japanese sets per accident.
For example I ordered a Vstar Universe booster box when it first came out from the Pokémon center Japan. This first print had a booster box without paper zipper. When they reprinted the set a few months later they came with the paper zip.
I didn’t follow up on this since I did not care since the cards itself are the same (at least to my knowledge).
Another easier example are the shiny star V Booster boxes where the second print box didn’t have the stamp on it referring to a code card inside. The cards themselves weren’t any different.
Then another example that comes to mind is Eevee heroes. I don’t know how to spot it right from the box but the cards holo was slightly different for the later reprint than they were for the original print run.
Here is a reference for the Vstar Universe booster box (with and without paper zip).
Sidenote: because of the paper zip the placement of some of the text is also different on the side where the zip is located.
I actually made a spreadsheet that continues the thread Will mentioned all the way up to current sets.
Was prob gonna post it in June when TCP updates their yearly numbers.