For the basic frog combo, not much has changed from BBCT to BBCS, other than damage and, like colendula explained, the ability to use it on Jin, Ragna, Noel, and Tager via winded 3c.
You can practice it in BBCT but you don't have to pull the weird input gimmicks to get 1-hit 3c in CS, so don't worry if that messes you up. If i recall correctly, Tsubaki is a 2b otg character and Hazama is a 3c, but I could have those swapped.