There’s actually several different Pennsylvania accents.

Pittsburghese: Also known as the “Yinz” accent, mostly spoken in the southwest part of the state from Johnstown south and west.
Altoona: A blend of the central Pennsylvania accent and the Pittsburgh accent, mostly spoken between Johnstown and State College.
Central Pennsylvania: Very similar to the Pittsburgh accent, but more “southern” sounding, yet not. Spoken in most of the central part of the state from Altoona to about Harrisburg.
Philadelphia: Spoken in the Philly area.
Pennsylvania Dutch: Spoken around the Lancaster area, but can be found in pockets all over the state, mostly from Amish and Mennonite families. Almost like a softened German accent.
Northern Pennsylvania: Mostly spoken in the northern, wilderness part of the state. Sounds almost Canadian, much like the Upstate New York accent.

But it’s not a different dialect. “Dialect” implies that there will be occasional intelligibility problems, like when listening to Scots or Frisian spoken (Frisian is actually a separate language, but mutually intelligible for the most part with English).

I agree, having lived in both Southeastern Pennsy & Jersey, you all have accents. I’ve heard the North Jersey, Central & South Jersey accents, subtle at times but they’re still there. In Pennsy, it’s the same way, sometimes even towns have their own accents & Philly has several.

Then you throw in people like me, whose been all over the place & has multiple accents. LoL

Pennsylvania doesn’t have just one accent. It has several. New Jersey also doens’t have just one accent. It has several.

I work with people who live 20 miles and they have an accent to me and vice versa.

Depends where in both states. Obviously if you’re a noith joisey accent, even slightly, you’ll get noticed. Most of the rest of NJ is too similar to most of PA for anyone to pick up on it. Parts of south Philly have an accent, as do some of the more historically blue collar areas around Pittsburgh. Southwest PA/Mon Valley area can take on an a slight Appalachian accent. And the north central PA you can sometimes find more rural accents. But in general any accent you have won’t be noticeable and vice versa.

each state has their own dialect and accent

If you’re near Philadelphia, the accents may be similar. Near Pittsburgh, it’s hard to tell.

yes evry different but not to most people unless you are a master at dialects

Very different.

Probably very little difference.
Unless you’re one of those that says you’re from “new joisy”.