Api.versionsFrom('...version...') vs api.versionsFrom('...@...') in package.js

help
1

What difference api.versionsFrom('...@...') vs api.versionsFrom('...version...')
Ex: api.versionsFrom('METEOR@1.0'); vs api.versionsFrom('1.2.0.2');

2

From the docs:

meteorRelease String or Array of Strings

Specification of a release: track@version. Just ‘version’ (e.g. “0.9.0”) is sufficient if using the default release track METEOR. Can be an array of specifications.