Use rigify for 2 or more models?

Hi Guys,
I’d like to use rigify to rig more than one model in the same blender file.
I’ve successfully used rigify to rig up 1 model, but when I try to apply the same process (add new MetaRig > align metarig to mesh, hit Generate) to another model in the same file, nothing happens, it only change the original rigify.

Thank you.
I’d greatly appreciate any help.

You may have to duplicate that same rig instead to avoid compilations.

Rigged characters are usually created each in their own file, then linked into a production file for animation/interaction.

Thanks to XeroShadow and rontarrant for your advises. I will give those a try.