This is a follow on fix to [JDK-8339644](https://bugs.openjdk.org/browse/JDK-8339644). It turned out that TZ data files allow abbreviation of keywords, such as "ZO" for "Zone." Same fix, i.e, replacing `startsWith()` with `regionMatches()` was applied.
------------- Commit messages: - initial commit Changes: https://git.openjdk.org/jdk/pull/20940/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20940&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8339803 Stats: 41 lines in 4 files changed: 7 ins; 4 del; 30 mod Patch: https://git.openjdk.org/jdk/pull/20940.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/20940/head:pull/20940 PR: https://git.openjdk.org/jdk/pull/20940
