Terence. Originally and for many years in the ISTD Revised Edition in their Rumba there was no New York. There is now I beieve.
The part which I call a Cross Body Lead is steps 4 5 6 of a Closed Hip Twist. Those 3 steps are used often from other positions. Call it what you will, it still gets the lady out to the man's left side moving across the front of his body. Let us all raise our hats to West Coast Swing.

Again, terminology has quite different meanings in some cases. The NY to which you refer, is a Crossover break in Amer. style.

A CBL is a completely diferent lead and body position ,than that preceding a Fan. It is not only a different variation in content; but is also used in many of the Smooth dances ,as well as Rhythm.

What should be known is this..the " english " re- named several Standardised American variations, in an attempt to create a new paradigm.
Also to consider, the technique for comparable figures is completely different in most cases .

Terence. If you were asked to give a name to steps 4 5 6 of the Closed Hip Twist for the lady which is. Step LF on beat 2. Step and turn at the end of beat 3 with the RF. Step back ( a Backward Walk ) on the LF on beats 4 1. The lady is now in the Fan Position.
Those three steps can be used from dozens of positions and shapes.
What name would you give it if it wasn't part of the Closed Hip Twist. The easy way out I suppose would be to call 4 5 6 of the Closed Hip Twist.
If we go to another dance , the Waltz. We have 4 5 6 of a Reverse Weave which becomes, if we do a Chasse to the Right an Outside Change. Identical steps in both cases. The day will come when somebody will have to unraval the name of the steps in most of our dances to get them into a book form that can be understood. I'm still reading Wally Laird and Alex Moore. The others I haven't bothered to get.

You can "take " components from many figures and see similarity in content. That , in and of itself, does not qualify it as being the same.

The differences are there for a reason .The styles of the 2 divisions ( Amer.. Intern. ) are bound to have some similarities as they are from the same roots . However.. they are danced comletely different at Social and competitive levels in all dances .

What has happened over the yrs is this.. the Amer. Smooth has taken on many of the Intern. style figures as part of its syllabi at advanced levels ( some have been there since the 50s, in "Gold" ).VW has an abundance of variations that are used in comp. work.

The comparisons in the Rhythm dances is generally more distinctive, tho some would say that has also made a move towards the Intern. in style particularly in Cha and Samba .

Terence. I was looking at a Chasse in the East Coast Swing. I could not pick the difference between The International Jive and it. I always thought that the East Coast Swing was flattish without the bounce we see in Jive. I could be wrong.

Again, a strong similarity.. after all, it was designed on R and R and E.C Swing. The notable absence is the " dig " accent that is prevalent in ECS. and they do count the rhythm differently ( many count it 1,2,3,..1,2,3, and rock step ) in reality it should be 1 and 2.. 3 and 4..1.2... another basic that " splits " 3 bars

Terence. I know nothing about ECS. But I have watched a demonstration of the Basic Rock Step and Chasses. There appears to be Eight Steps over six beats of music. If that is correct why isn't the count 12 345 678 = 8 steps over 6 beats. This is how the International Jive is counted, or I should say . How it should be counted.

The basic figure is supposed to reflect the rhythm of the music from that era ( it is loosely based on jazz among other native rhythms ).

This double syncop also occurs in many latin rhythms which I,m sure had a large influence.
"Styles" of dances are usually built around a musical concept, and are further developed by improvisation.

ECS is a much more relaxed form of Jazz/ Blues type music .
The "Swing " genre has its roots in many dances suchas.. Balboa, Lindy,etc.
ECS is really a hybrid ,that was constructed so that it could become a socially acceptable dance of its era. .

One of our judges in Our Dancing with the Stars made a comment. They said I see you added a bit of ECS as well as Lindy in your Jive, all very aceptable.
I took that to mean they went from the bouncy action in their Jive to the flatter style and back again.

if you think about that, its really an arrogant statement.

More correctly would be .. " I see you have added some Jive to your ECS ! ".