Reiff and colleagues found that perceived similarity between one’s present and future self is positively associated with life satisfaction 10 years later, using a difference-score approach to operationalize similarity. This study further evaluated the similarity effect by reproducing the original longitudinal association with a difference-score method, by using more sophisticated analyses (i.e., polynomial regression and response surface analyses), and by replicating the association in a newly collected sample. We were able to reproduce and replicate the findings based on a difference-score approach. However, we did not find a similarity effect in either sample using more sophisticated approaches. The current results show that previously reported support for the association between perceived similarity and well-being is driven by the statistical main effects of personality reports.