I don’t know if you’re asking about boxing or MMA, and I can only talk from a boxing perspective.
The best way for you to get an idea, would be to spar with a pro. It’s honestly a very different ball game in boxing, almost a different sport. I have a style where I would make a better pro than amateur, since I am not a great volume puncher, and I do best fighting off the back foot. From my experience, if you fight as I do, you spend a lot of your time catching and slipping punches that are relatively ineffective. In the amateur game, you sort of have to do that, otherwise someone will just outscore you with pitty patty punches. The actual time you’re in the ring isn’t long enough to wear someone down, or for a fit guy to have to pace themselves. So, in my experience, although I have won many more than I have lost, I have lost a fair few bouts on points against guys I am confident I’d hammer over a longer duration, and with a scoring system that didn’t reward feather fisted punches. To give you an idea, I once lost a decision (away) by 16 points, and I didn’t have a mark on me at the end of the bout.
By contrast, from the few pros I’ve sparred, the emphasis is much more on landing hurtful shots. Fewer, higher quality punches, with more commitment behind each one. The pros aren’t so worried about leaving themselves open to ineffective punches, that would score in amatuer competitions. Also, watch a pro bout, and then watch an amateur bout. In the amateurs, most guys dont use angles all that much. They regularly go straight backwards/forwards in a fairly predictable way. Pros are much better at stepping off, using their opponent’s momentum against them. In the amateurs, it is often just a melee of punches, and it is hard to throw effective punches when you opponent is throwing feather punches at you in high volumes. by contrast, the pros want you to punch, because that is when you leave yourself open. The pro game is a much more scientific one, in my opinion.