Which is newer version of java

which is newer version of java
a. RCA 1.3.1 build xyz
or
b. build 1.3.1-b24, mixed mode
this is what was obtained on doing a java -version on two different jdk installations
could you please let me know which one is newer

i would like to know which version is the newer version between the following two versions :
a. RCA 1.3.1 build xyz
or
b. build 1.3.1-b24, mixed mode

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