Different or sameactors doesn't really matter.

Gotham had a different creative team and more importantly, a different network. No network is going to promote another network's shows.

However I would like to see a Season 6 Of Gotham it kind of skipped too much at the end of season 5

I heard it’s in the same universe as “Superman and Lois” and “Justice U”

You heard wrong.

Nvm it was Gotham knights. I’m glad this show is not part of the Arrowverse, the series recently just relied on crossovers. I’m both sad and glad it’s ending.

Gotham Knights is also not in the same universe as “Superman and Lois” and “Justice U”

Some people dared to say that Pennyworth and Gotham were tied. I believe that Martha and Thomas would have been too old to conceive by the time that Bruce was supposed to be born. But at least I can see some resemblance between Thomas and Bruce from each series.

I don't know but u are probably right

According to Marc Guggenheim, it was originally meant to be part of the crossover along with Krypton.

https://twitter.com/mguggenheim/status/1420443877513773058

They're totally different and have no connections to one another.