Here is a simple Jain view on the difference:

• Paap (pāpa)

- Meaning: sinful karma or unwholesome actions that bind the soul and cause karmic bondage. - What it does: paap is the actual karmic consequence of wrong conduct (violent acts, lying, stealing, immoral sexual conduct, etc.). It is something the soul accumulates as a result of harmful actions and intentions. - Example: telling a lie, harming a living being, stealing, or sexual misconduct. These actions create paap that weighs on the soul and delays liberation. - Note: The five major paap (often taught as the Panch Mahapap) are violence, falsehood, stealing, sexual misconduct, and possessiveness; these are specifically warned against for spiritual progress. ( jainknowledge.com)

• Dosh (doṣa)

- Meaning: a fault, defect, or blemish in conduct, intention, or understanding. - What it does: dosh refers to the personal fault or mistake in a given situation. It is a blemish of character or a mistake in one’s behavior or mindset. It does not by itself always mean new karma; it signals a spiritual deficiency that should be corrected. - Example: a lapse in discipline, improper intention, or a moment of inappropriate conduct. In Jain teaching, recognizing a dosh often leads to repentance and self-purification practices (like pratikraman), so one can avoid repeating the fault. - Note: In practice, dosh is used to describe faults in behavior or ritual-intent, and can be discussed in contexts like impurity or wrong conduct, rather than being the same as paap itself. ( jainknowledge.com)

Diff between them in brief

• Paap is the karmic consequence (the actual sinful karma) that binds the soul.
• Dosh is the fault or defect in conduct/intention that one should acknowledge and rectify; it points to a moral/ethical shortcoming, not a direct description of karmic bondage by itself.

Links for further reading (JainKnowledge.com)

• You can read more about paap here
• You can read about the concept of dosh in context here