If you are just updating slackware 14.1, yes.
Make sure that you uncommented only one mirror, for your edition: same version (14.1) and architecture (32-bit or 64-bit).
If it's the first time you use slackpkg, in principle you should first run (only once, then forget it):
slackpkg update gpg
Also, slackpkg install-new is usually not necessary as the distribution doesn't get new packages once released. That command is mostly intended for people running -current or wanting to use slackpkg to upgrade from one version to the next one.
To know more:
man slackpkg
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