What is the difference between the cadillac STS and the SLS?

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    STS is the Successor of SLS... (SLS) started with the 4.9 L HT-4900 V8 but got a 270 hp (200 kW) LD8 Northstar V8 for 1994, while (STS) also started with the 4.9 L HT-4900 in 1992 but was upgraded to the 295 hp (220 kW) L37 Northstar in 1993

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