This depends on how you define "personality" and "values". Because for example, according to psychological research, personality traits (as defined by the Big 5 model of personality) are strongly correlated with things such as political beliefs (which could be argued is a subset of a person's values at least), and are largely stable over time. So it wouldn't be too much of a stretch to suggest that the more similar the personalities between a couple, the higher the probability of them also having a large set of overlapping "values", however you choose to define them.