Sledging is the practice in cricket of insulting opponents to break their concentration and cause them to make mistakes. Sledging is effective because the batsman stands within hearing range of the bowler and certain fielders. The aim is to intimidate or distract the batsman into making a fatal mistake and being dismissed. Sledging thus tries to “break the flow” of the batsman’s game.[citation needed] There is debate in the cricketing world over whether this is poor sportsmanship or good-humoured banter.
Trash-talk is a form of boast or insult that is common in sports and other competitions. It is usually used as a way to intimidate the opposition, but can also be used as humor. It is characterized by wild exaggeration and improbable similes, such as, “Your team can’t run! You run like honey on ice!” (that is, stiffly and slowly). Bad puns and other wordplay are also characteristic of trash-talk. Pointing out articles that discuss the weaknesses in a rival team, is not trash-talk. This is commonly referred to as a discussion topic. This can intiate a trash-talk environment, if one of the participants in the dialog is immature.
They sound like the same thing to me.