Not necessarily. Compatibility is not an inventory of matching preferences. Two people can like different things and still find forms of intimacy that work for both. The reverse is also true: sharing the same fantasies does not automatically create safety, pleasure, or the ability to listen to each other.
It may be more useful to ask how a couple handles difference. Can either person say no without punishment or resentment? Is there curiosity without pressure? Can they distinguish a request from a demand? Can they look for overlap without turning compromise into repeated self-betrayal?
Some differences are easy to build into a shared sex life: alternating pace, expanding the repertoire, or leaving room for solo sexuality. Others may be fundamental—especially when one person’s desire crosses the other’s boundaries, or when the only acceptable script for one is unacceptable to the other.
Compatibility is rarely a finished state called “we match perfectly.” More often, it is a process of noticing differences, discussing them honestly, and creating room for both people’s consent to remain real.