does Hispanic sitcom (I'm sorry if that's not the correct term, but what do you call it?) differs greatly from it's American counterpart?
The technical term would be "Comedia de situación" which just means Situational Comedy (sitcom), but no one really calls it that, its just comedia (comedy), or chiste (joke), or de risa (of laughter).
There aren't as many as american ones, pure sitcoms are very few and far between, as comedy is usually something added to Telenovelas or just TV-series in general, usually as a break from the over the top melodrama (which can be comedic in on itself), so its usually tied to Romcoms, otherwise, i can barely name anything (Vecinos, La Familia P. Luche, and Padres e Hijos).
As for themes, Latinamerican comedy is more about making fun of every day life, including some negative things, like making fun of getting mugged, or making fun of hiding from your landlord to avoid paying rent, or making fun of your car not working, or the usual stuff, like making fun of politicians or celebrities.
What's it's impact to Latino's culture in general?
Sitcoms? Besides El Chavo, barely anything really, the closest stuff that gets the fanfare is usually Telenovelas which have comedic moments, although some well known comedians dub movies.
Keep in mind El Chavo was so succesful it was only taken off air around 2020, so if its Sitcoms, it was El Chavo, there are some other shows, but none made it THAT big.
Any notable names beside Chespirito?
You see, in Latin America, Mexico pretty much dominated TV, so if you ask a Latino, they will give you Mexican ones, and ones from their own country.
Mexican ones: Cantinflas, Eugenio Derbez, Jorge Ortiz de Pinedo Pallás, and Adal Ramones.
From My country: Fernando Gaitán, and Andrés López, are the only ones i know are kinda known overseas for their work.