How to use the same list in puppet for multiple locations

gistfile1.txt

$perl_modules = [ 'Data::Pageset', 'perl-module-b' ]

perlbrew::install_modules {
    $perl_modules:
       perl => 'a-version-of-perl'
}

perlbrew::install_modules {
    $perl_modules:
       perl => 'a-different-version-of-perl'
}

# or even something like

perlbrew::install_modules {
      'some-name-1':
             perl => "a-version-of-perl",
             toinstall => $perl_modules,
}

perlbrew::install_modules {
      'some-name-2':
             perl => "a-second-of-perl",
             toinstall => $perl_modules,
}

but it's then how to go through the list and merge with the 'perl'
to create a unique identifier which can be passed to a method
along with the module name that I'm not sure on