What is the difference in the signatures shown in gray font and blue font on the Web "Plan" page?

[Blue font signature]
It is a signature containing the latest detection pattern in the version of Vex.

[Gray font signature]
It is the old signature used in the earlier version.
It is intended to maintain compatibility of the earlier project data.
In general, vulnerabilities that can be detected by gray signature can be also detected by blue signature.
For this reason, it is not necessary to select gray signature as the signature to be scanned unless there is any reason to perform the scanning with the same signature as the scaninng result performed in the past.