How do I switch from Portupgrade to Portmaster?

I've given a FreeBSD to run a webserver and I always use Portmaster, but it's been installed wit开发者_如何学Goh Portupgrade.

Is there any problem if I simply start using Portmaster?

Portupgrade and portmaster are interchangeable. You can safely use them together on one box, since they are separated from ports database.