There is actually quite a big difference.
NSW pulled some power from other states, maybe I don't know. but it was limited as % of their total output. Yes they also called on Tomago to cut load for which they have a contract to do so although I heard the GM complaining it was longer than the contract time frame.
SA pulled the bulk of their power from interstate and had black outs as well. SA's load varies from ~1000MW at lowest to 3500MW at highest and they have through their reliance on wind, limited base load Gas a 700km long inter-connection and back up generators. That's a massive swing and more than NSW has to deal with and one that is always costly to deal with and a result of having limited industry to provide a base load.
SA needs a base load generator for summer, around 800MW. Coal is usually the easier choice as the coal is easier and fare cheaper to stockpile. For example 1 x train set could be running a continuous loop from say NSW to maintain the stockpile all year round. No peak prices to compete with.
What are NSW's plans for dealing with a similar crisis in the future, apart from rolling blackouts in Ballarat and Bendigo? To quote from the SMH article:
"Mr Adamo [Australian Energy Market Operator spokesperson] defended arrangements that meant Victoria shared the pain to ensure key infrastructure wasn't damaged by the heavy loads, saying that was how the National Electricity Market was designed to work.
'If you export less to NSW, then ... you'd have to do more load-shedding [in NSW],' he said."
Why doesn't the National Electricity Market apply to SA. 10,000 homes blacked out in one state doesn't seem any different to the same number in another, the fact that it's a smaller percentage is little comfort to those in the 10,000. Tomego didn't see it as a bullet dodged:
The energy market as a whole needs investigation, eg the unavailability of power plants, both gas and coal-fired, at critical times and the ludicrous situation developing in Victoria where it is proposed to import natural gas from overseas at Crib Point. As manufacturing is in decline in Australia, eg Point Henry aluminium smelter and car manufacturers closing, it is hard to see private industry building a coal-fired power station(s) that is only needed 10 or so days a year. With the Tomago situation above, there's a hint that fixed-price power to the smelter was curtailed so it could be sold elsewhere at the higher spot price.