The difference between the burnt dry bar and the wooden pestle dry bar is mainly due to the different production technology, so the taste is different.
Roasted beef is fresh lean beef, which is salted, roasted with charcoal, shredded with a wooden pestle and eaten directly. Because it is burned with charcoal, it is called roast beef.
Wooden pestle dry bar, such as the one in your photo, is generally air-dried beef marinated with refined fresh meat, which can be eaten directly, that is, hand-torn beef, but a better way to eat it is to bite it in a microwave oven and then beat it with a small wooden hammer, so it is called wooden pestle dry bar.