Identify the existing section
Have the manufacturer, model and approximate age available if known. A similar panel pattern does not establish interchangeability. Matching dimensions, construction and connection details matter, and an exact replacement may not remain available.
Consider the rest of the assembly
Ask whether other sections, hinges, tracks or lifting components were affected. A focused section replacement makes a different proposal from a complete new door. The condition of the remaining assembly should be part of that conversation.
Decide what appearance means to you
A replacement section may not match a weathered finish exactly. Compare the likely result with the appearance of a new door and the overall repair scope. Avoid selecting a panel solely because a photograph looks close to the existing design.
Your questions
Can any panel of the same width fit?
No. Width alone does not establish compatibility with the door construction and connecting hardware.
Should I keep using a dented door?
If its movement changed, hardware is loose or a section is unstable, stop using it until it has been assessed.