[opensuse] SSL Certificate question

This is probably a dumb question but here goes.

A year ago I made a private key, and generated a csr for signing. Got a certificate good for one year.

Question one. Is it technically possible to use that same private key to generate a new csr for signing again now?

Question two. If so, is it advisable to use the same private key, or better to generate a new private key now?

Many thanks,

Jim F
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