Dear Anonymous,you did put them well. They are different . Straighten arriving leg is a good sign indicated what the step will be .
I practiced immediately the reverse turn in heel turn : RF backward without bending , press RF ball transfer the body weight toward the heel , just let the LF heel spontaneously close to RF reacting to step one , it looks as if smooth . Of course ,I am not sure if it works when dance with my coach. I thought there might be other technique to learn.

Logical thought: knowing the lady step first then holding on male left toe a little bit longer to allow for that she has to turn on one spot. Delay body weight transfering helps to distict the heel turn from reverse turn.
You provided a clear clue for thinking and solving the problem. Thanks.
I noted my reverse turn following feather step in foxtrot usually looks harsh . (I had ever tried to push my standing hip with my RF backward ( heel outward before touching the floor ), extend my left side with drawing LF at the end of bit one to create the space for man's RF. Both of us were unsatisfied. In my situation ( I am a beginer , a student .) the above-mentioned thought is unable to practice, I should solve it on my own way.:((