Can I use a case study as a template for my own campaign?

Yes, and that is exactly what case studies are for. A campaign that already worked gives you a proven framework to adapt instead of starting from a blank page.

• Pick a case study that matches your industry, audience, or goal as closely as possible.
• Note the products, quantities, and formats used, since those choices drove the result.
• Adapt the timing and messaging to your own offer rather than copying it word for word.
• Track your own numbers so you can tell whether the approach transfers to your market.

Treat the example as a starting recipe. The structure carries over, but the details should reflect your brand and audience.