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Tomcat:9 what does it mean?

If i go to: https://hub.docker.com/_/tomcat
everything to the left of the line containing the nine is possible right?
So I get an 9.0.36.-jdk11-openjdk which is the most precise description I could have provided instead of just nine.

So sometimes in future I could get a:

(Bugfix)
9.0.37-jdk11-openjdk right?

or
(New feature release)
9.1.0-jdk11-openjdk right?

or even (a different JDK ???)

9.5.0-jdk14-openjdk-buster ?

Which risk do i take if i do not precisely configure the version within the tag?

Many thanks for you jelp!