The karate form is from Shotokan. Lots of us know it. It starts with a series of blocks, goes into that rotating escape from a wrist hold and at the end there are those two punches for someone grabbing your from behind, right?
Now... The kungfu version was tricky. Initially I thought that I'll find everything I need in Wingchunquan, but I have never found a rotating escape in any Wing Chun forms. So- I borrowed "Snake Shoots Across Valley" for the spear hand. Kept the escape and for those two attacks to the rear I added two doses of "Tiger Bites it's Back".