I trained SKK for about 7-8 years, got to 2nd Brown, and taught for a few years as an assistant instructor. For the last 3 of those years, and the 3 since, I have trained in American Kenpo (specifically SubLevel Kenpo).
I found that very few of my basics were transferable: Stances were almost entirely different. Footwork was of course then different. USE OF stances was different within techniques. Blocks are executed differently, at different heights than in SKK. Strikes are taught in more detail in AK than in SKK, but were pretty much "the same".
SKK is so different from teacher to teacher... but at the school I was at, it was taught more by copying what the instructor did, than being taught specific methods of execution in terms of anatomy and movement. The AK instruction is much more detailed and technical - describing HOW to execute an inward block ("first extend your arm as you rotate the shoulder etc...") as opposed to the instructor standing in front of you, showing you an inward block, and then you copy what you think you saw... Not every AK school is the same either so that difference may not apply across all SKK and AK teachers.
I found AK's model of what is taught, when to teach it, and how it relates to the other material to be far superior to anything like that I ever saw in SKK. My teacher had a specific order in which his techs were taught, but there was not much of a "adding on" or a building upon previous material as much as it was just "ok here is the next thing". The SKK system had 26 techniques for a right punch. A handful of those techs came with some definitive reason to do that technique - "this one is for when he throws a left hook after the right" or "this one is for when he tries to kick you first". But mostly it was 20+ different responses to the same attack. Your mileage may vary, not all SKK is the same... but I surveyed a lot of SKK schools and it wasn't that much deeper in most places.
In the AK I am studying, every technique starts with an analysis of WHY it is happening. The psychology and motivation of the attacker. So while 2 techniques might appear to be addressing the same attack, there will be differences in response based on more subtle factors. And also on the skill level of the student. For example - Left hand lapel grab, right hand lapel grab are not addressed as mirror image movement because the psychology behind an attacker grabbing you with his strong hand, versus with his off-hand, is different. A guy who grabs you with his strong hand is not immediately planning to punch you... he may get to that, but if he was going to start with hitting you, he'd grab with his off hand and hit you with his strong side... and 90%of the time, that's his right hand.
Generally you will find AK uses a lot of well - defined vocabulary for ideas and principles and everything. SKK didn't seem to be quite as codified. More of an "oral tradition" whereas AK is "of the book".