MacPorts installation processes

[db]

On 10 Nov 2017, at 23:18, Mojca Miklavec <mojca.miklavec.lists at gmail.com> wrote:
> On 10 November 2017 at 23:00, db wrote:
>> Is it possible to install a snapshot from master and later upgrade to a release?
> Only to a release that's derived from master. That is: if you install
> a snapshot from master now, you will only be able to go "back" to one
> of the 2.5.x releases.

I installed master from past 11th of October. If there were a 2.4.3 release, could I upgrade to it, or only just 2.5.x? I ask because I noticed port version returns 2.4.99.