nope, in my estimation there is no difference... You ask 10 photographers that question and you will probably get 10 different answers..
just different catch phrases..
like when it comes to weddings, sure Im going to use the word photojournalism, photojournalistic, etc...
when Im talking about a family or a children shoot... I wouldn't use the word photojournalism... to me it sounds better if I talk about a "family lifestyle" type of shoot..
just my .02