The above are all considered to be different tribes/kingdoms of Germanic peoples that existed in some form between 0-800 CE.
I'm mainly looking for comparisons between as contemporary versions of them as possible (for example comparing Franks of 800 to Visigoths of 400 would ignore the effect of time on cultural change, but I'll take it if better isn't feasible). Though if looking at the tribes from different times allows a comparison of them with less Roman influence, that could be helpful.
Now for the question itself: I'm mainly wondering how much are they practically distinct cultures/peoples or are they really just different political units of the "same people"?
By practical culture I mean things like: Would they all understand each other? Did they look alike? Did they worship same gods and/or in same ways before conversions to christianity? Did they share habits and mannerisms? Did they dress similarly? Were their diets comperable? Did they organize their families/society in comparable manners? Did they value the same things? Would they see each other as some level of kin? etc.
I hope the question isn't too broad and thank you in advance!