They seem to be roundwound. I didn't know there were flat or round! What are the differences?
Flat wounds feel and look like... well, you know, like... flat? OK, let me try the opposite approach:

When sliding along a roundwound string you feel the rills (threads of the winding), and you would notice the noise your fingers make by sliding over them.
I have a very very very old set of Rotosound roundwound strings on my main bass.
I love it - it sits in the mix very well to my ears.
I have a quite new set of Elixir roundwound strings on my second bass.
It still can deliver way more brightness; very sharp attack in the mids and treble.
It is just a different beast with its own purpose.
If you're satisfied with the sound: keep them, they are proven-in-use and broken in. Never change a running system.
If you're going to cover, let's say, Yes, then you might want new strings
