Both Lian Zhen and Tan Lang receive peach blossom descriptions. Reducing both stars to attraction makes them look interchangeable and removes much of their traditional meaning. This comparison concerns the individual stars, not their same-palace combination.
Tan Lang: interests and engagement
Tan Lang is associated with appetite, varied interests, social contact, and artistic expression. A hypothetical person who enjoys music and meeting new people illustrates some of those themes. The example says nothing conclusive about their fidelity.
Lian Zhen: investment and boundaries
Lian Zhen also carries themes of rules, restraint, and positions within relationships. Someone who socializes infrequently but cares deeply about a broken agreement raises a different question from someone seeking a wider social circle.
These examples are not personality categories. A single star cannot establish someone's private motives.
Transformations and palaces further change the discussion. Lian Zhen in Career should not receive an unchanged romantic description from the Spouse Palace. Tan Lang's gain and difficulty transformations also require different analysis.
If the two stars actually share Si or Hai, study the combination rather than splicing two separate personality lists. Clarify whether your question concerns social access, creative interests, commitment, or a specific breach of trust. The broad peach blossom label cannot answer all four.