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NG plants tend to use gas turbines, which can ramp very quickly indeed. Steam plants are a lot slower (thermal stresses and whatnot).

Very little electricity is produced with oil, BTW. Steam plants are usually coal or nuclear.

Note: many bigger gas plants are combined cycle, the exhaust of the gas turbine generates steam in a waste heat boiler for a steam turbine. Often multiple GTs on a single ST.

Natgas is a turbine engine directly; coal and oil uses a boiler running a steam turbine.

They are similar, but outside of small islands few people use oil for power generation due to the high cost compared to natural gas.