Podman is the RedHat implementation of the Open Container Initiative (OCI).
A Dockerfile and a Containerfile are both OCI. Docker and Podman can generally both use either.
Contrasted with Docker, Podman has better security defaults, and installers and licenses that are both actually open source. (Parts of Docker are open source. Parts are not.)
Docker used to lead with additional features beyond OCI such as Docker Compose, but Podman Compose has been a thing for a while, now.
The more mature a product is, the more likely it works perfectly with any OCI compliant tool.
For rookie work, I feel like there's still fair odds the developer only uses Docker and may rely on some anti-pattern that requires setting "bad security=ok" settings before their project will work in Podman.
Your mileage may vary.
Interesting.
I used to do it the way you're recommending (before I had podman compose), but I got tired of installing docker compose, and haven't suffered enough for just using Podman compose, lately.
I do think more things are more likely to work the way you're saying. Compose doesn't seem to be standardized yet? And the original dev was probably using Docker compose - for any randomly selected project.
But when I can get away with podman compose, I do, as I recall it being much easier to setup.