First the Grammar Police, now the SYNTAX Team...
Yes, you have described the phenomenon of why one book is preferred over the other.
If I were to clarify my answer to be more helpful to the OP:
Step Up to Medicine is great for both your rotation and your Step2CK
Step Up to Step2CK is a bit flimsy, but a decent source of review.
I did not use Step Up to Step2CK. Rather, I used First Aid for Step2CK so I could be different. I am a natural contrarian (who apparently is so contrarian as to use poor syntax)
And no... there is no malice in my (textual) voice... one quip deserves another.