AFAIK, as long as the PATH points to the right PERL, the rest should follow on naturally. You might want to set PERL5LIB too.
You shouldn't revert the path; any program that uses your 5.16.1 version should have the correct environment to run in.
Your program can of course check which version it is running by means of a use 5.16.1;
Someone correct me if I've got any of the above wrong :-)
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