sourceVersion

The version of the launch template on which to base the new version. Snapshots applied to the block device mapping are ignored when creating a new version unless they are explicitly included.

If you specify this parameter, the new version inherits the launch parameters from the source version. If you specify additional launch parameters for the new version, they overwrite any corresponding launch parameters inherited from the source version.

If you omit this parameter, the new version contains only the launch parameters that you specify for the new version.