Thanks jZed? I ran this instead (needed it within a Perl script):

use lib "/usr/home/username/modules/";
use DBD::mysql;
print $DBD::mysql::VERSION;
[download]

I tshowed up the one I installed, and not the host's older one. However, when I remarked out the use lib line, it found the host's version. So, now I've answered some of my own OP.