Questions regarding Zephyr's testing framework



I am trying to get a better understanding of Zephyr's testing framework.
I have read the documentation, but I still have two questions:

1. Is there a meaniningful difference between the terms "board" and
"platform" or are these used interchangeably?

2. Do there exist fixture names that are deduced from the board's
configuration or are only those considered that are defined in
the hardware map / provided via command line?

As an example, if the respective YAML file in /boards defines:

- gpio

does this already fulfil some of the fixtures mentioned in the
documentation with the prefix gpio_?

Best regards,

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