Original part has a flat bottom. Modified part has the angled bottom.
The author remixed this model.
Original model had a small issue where the nut recess was oriented incorrectly, preventing the nut from inserting into the pushrod all the way, leaving it 0.3mm out of concentricity. While the model does work, the rod will rub inside the walls of the pushrod and it puts some stress on the parts when they are forced into position (Pushrod will be at least 0.3mm out from the carrier it fits into.)
Files attached are for the Mini DIg, Mini Dig Push Blade and Mini Dump, they have the same file names as the originals.