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Broadly speaking they are often used interchangeably but it depends on the perspective you’re looking at it from. If you’re asking is probably because in Nyx they are sometimes used as different entities.

The difference is subtle and it all revolves around the prefix and is better explained by an example: 1.2.3 is a version identifier while v1.2.3 is a release identifier, using v as the prefix.

Formally speaking, the release identifier is the version identifier with an optional prefix. The two are the same when the prefix is not used.

When using Semantic Version you might have noticed from the FAQ that v1.2.3 is not a semantic version, although the rule is often relaxed to meet common practice in using the v prefix. If you read that meticulously, it says not a semantic version, not mentioning the release.

While the above may seem a syntactic tweak, it can be generalized as follows: the release identifier is the name of a publication of a specific version.

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