OK, so a bit of confusion all round there, here's what I do to sort it out.
There is a similarity, and many tunes cross-over between r'nr and jive (ballroom jive) but not always.
This works for me.
I use the dance steps as a count, (that means its what your feet
should do on the floor)
Just listen to it and mentally talk these steps through, as follows:
Rock 'n Roll has a count of:
back, step, one, two : back, step, one, two
Like this: Eddie Cochran -
C'mon everybodyBallroon Jive tends to go with a count:
back, step, one-two-three, one-two-three : back,step, one-two-three, one-two-three
Like this: Beach Boys -
Little Deuce Coupe (stupid silent intro)
but as you can see, you could just as easily give a count of: back, step, one, two to that one.
There are obviously tons more, going right up to date, but I've tried to pick tracks where the count screams out at you. For that reason, you can't beat (pun!) the golden era of rock 'n roll.
Hope that helps, though I fear I may have made it all worse.
Hell, I ain't a dance instructor, I'm no Patrick Swayze either