These two words mean basically the same thing. Peter speaks of his readers as people who are living in foreign lands away from their home. See how you translated "foreigners" in [1 Peter 1:1](../01/01.md). (See: [[rc://en/ta/man/translate/figs-doublet]] and [[rc://en/ta/man/translate/figs-metaphor]])
Here the idea of flesh refers to the sinful nature of humanity in this fallen world. Alternate translation: "to not to give in to sinful desires" (See: [[rc://en/ta/man/translate/figs-metaphor]])
Here the word "soul" refers to a person's spiritual life. Peter speaks of sinful desires as soldiers that are trying to destroy the spiritual life of believers. Alternate translation: "seek to destroy your spiritual life" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-metaphor]])