Can a standing-seam clamp's load rating be reused on a different roof profile?

Not without verification. A load-test result applies to the tested clamp and roof configuration, not simply to a clamp model name. S-5!'s selection guidance matches its test tables to the roof manufacturer, profile and material thickness. Its testing covers different gauges, geometries and materials. For a different roof, obtain evidence applicable to the exact clamp, seam profile, roof material and thickness, and have the project designer confirm the permitted attachment layout and design loads. Do not use a similar appearance or another manufacturer's test result as proof of capacity for an unverified assembly.

Sources: S-5!, 'How Can I Find the Right Clamp for My Standing Seam Metal Roof?': https://blog.s-5.com/blog/what-clamp-will-fit-my-standing-seam-metal-roof S-5!, 'Test Protocols': https://www.s-5.com/test-protocols-how-we-test/