The Subterranean origin has access to (and starts with) the Subterranean Urbanization district specialization in their mining districts. These give access to the 3 building slots of the mining district, but accept urban buildings in addition to mining buildings while giving an additional 50 miner and 50 trader trader jobs to each mining district.
As others said, this is not the equivalent. Agrarian Idyll has the same exact issue. It feels like these Origins and Civics had very little time spent on them as the bonuses are uninspired and miss the mark on what made them originally work.
Previously they gave you an extra Building Slot per X Districts. Building Slots were one of the main ways to get jobs on your planet as that's where nearly all of your Specialist Jobs came from with the exception being Factory and Foundry. This allowed you to utilize your Basic Resource Districts to get the very important Building Slots, instead of using the City District as the City District only gave Clerks and Housing. If you wanted a Unity Planet, you could build Mining and Farming Districts to get some Building Slots, with minimal City Districts and you will still get the full effect of a Unity Planet by putting Admin Buildings in those Building Slots.
In 4.0 however, Building Slots are NOT the main way to get Specialist Jobs. City Districts are. So while yes the Subterranean Urbanization and Agrarian Village Zones let you build Urban Buildings, these Building Slots are MUCH less impactful than they used to be. If you want a Unity Planet now, you build a Unity Zone in your City District, and then build lots of City Districts. Sure maybe you'll still build one Mining and Farming District for those Building Slots but after than you'll just ignore those Districts.
Furthermore, the two Zones for Subterranean and Agrarian Idyll replace 50 Miner/Farmer Jobs to also get 50 Trader Jobs as pointed out. If you don't want those Trader Jobs (Which you very well might not), you'll have to build just the normal Mining and Farming Districts meaning you'll get NO benefit from the Origin or Civic despite building Mining and Farming Districts.
Lastly, there will be many times where you'll fill up those Mining and Farming Building Slots with the Mining and Farming Buildings that buff those jobs, again further limiting the Origin and Civics usefulness.
I don't mean this to sound condescending, but this is exactly the type of things people were worried about by rushing 4.0 out. The bugs are bad, but can be quickly fixed via patches as we've seen. The flaws listed here make it feel like no play testing was done on these, as it would have been obvious pretty quickly why the new Origin and Civic don't work that well. Fixes to things like this will likely NOT be made quickly like bug fixes are, though I'd love to be wrong about that. By rushing 4.0 out certain Origins and Civics feel like they'll be doomed for a long time.