No. Usually they have a better PBP person and the color person is someone from each team.
No different than when a game is on ESPN or FS1 and not available on local TV or MLB.TV (Fox as well though anyone can watch that for free with an antenna). That's just the way the biz has changed. When these national networks (and now streaming services) write the checks they are paying for exclusivity. MLB doesn't have the leverage the NFL did to keep its Thursday games on local TV (but they're still not available on Sunday Ticket). The patchwork is clearly not sustainable, just like the RSNs and blackout rules aren't, but it's gonna take a while.