/usr/bin/perl5.30 -V >p530;/usr/bin/perl5.34 -V >p534; diff -y p530 p5
+34
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bincompat5005=undef			<
Compiled at Dec 21 2023 03:10:25	| Compiled at Dec 21 2023 03:10:36

Also

  @INC:
    /Library/Perl/5.30/darwin-thread-multi-2level
    /Library/Perl/5.30
    /Network/Library/Perl/5.30/darwin-thread-multi-2level
    /Network/Library/Perl/5.30
    /Library/Perl/Updates/5.30.3
    /System/Library/Perl/5.30/darwin-thread-multi-2level
    /System/Library/Perl/5.30
    /System/Library/Perl/Extras/5.30/darwin-thread-multi-
    /System/Library/Perl/Extras/5.30	

The only folders in this @INC that exist are the /System folders containing core modules, and /Library/Perl/5.30 with this one file:

cat /Library/Perl/5.30/AppendToPath
[download]

/System/Library/Perl/Extras/5.30

/Network does not exist. Remnants of the build process for macOS?