The main difference between a compartment marksheet and an actual marksheet in CHSE Class 12th board exams lies in their purpose and the information they contain:

Actual Marksheet:

• Issued to students who pass all subjects in their first attempt.
• Shows marks and grades for all subjects taken in the 12th class exams.
• Considered the official record of your academic performance in Class 12th.
• Required for further studies (college admissions) and other official purposes.
  
  Compartment Marksheet:
  • Issued to students who fail one or two subjects and reappear for the compartment exam.
  • Only shows marks and grades for the subject(s) retaken in the compartment exam.
  • Will have a notation indicating "appeared for compartment" or similar wording.
  • Not considered an official record of your entire Class 12th performance.
  • May be required for some purposes alongside the actual marksheet (depends on the institution).
    
    https://school.careers360.com/exams/odisha-chse
    
    I hope it helps!