I've read about this a little bit, and from what i can find, they're the exact same as with PoW coins.
It is explained a bit more/better here, https://bitcoin.stackexchange.com/questions/8172/what-happens-if-two-miners-mine-the-next-block-at-the-same-time
Bitcoin clients always trust the longest chain, so if two blocks is mined on the same time, it's up to (51% of) the miners to decide which is going to be 'accepted' and which is going to be worthless.
This is one of the reasons why you shouldn't trust only a few confirms, as the confirms could be a orphaned blockchain. After "enough" confirms, everyone will mine on the "correct" blockchain, because any work(mining) on a orphaned blockchain is waste of power (unless your trying to perform a 51% attack).
Note that they're using the POW (bitcoin) perspective here, although that doesn't really matter.
The definition as per blockchain.com,
AdolfinWolf, I explained it yesterday. What do you think of it?
https://bitcointalk.org/index.php?topic=4943159.new