Your question doesn't make sense. What part are you asking about being the same?
75w85 is the viscosity, so that's the same.
GL-5 is the API category, so that's the same.
Not the same brand.
Not the same formulation.
The manual says 75w85 API GL-5 synthetic gear lube for limited-slip differentials (All Scat Packs have LSDs), so as long as the gear oil is 75w85 API GL-5 synthetic then you're fine. How many miles do you have on your SP? Any particular reason you want to do a service already?
Also, even though the Red Line gear lube has the additive I would still keep some friction modifier, such as TransX, on hand. The LSDs in the 2015+ vehicles have been known to be noisy when making sharp, low-speed turns unless additional additive is used.
Better? Don't know, I haven't done a service yet on my 16 but will probably use Mobil 1 75W-90 with the Trans-X for Posi-Trac additive. Either way, you can't go wrong with the Mopar oil and additive even though it is a little pricey. Never used Redline but most say it is good as is any synthetic GL5. If you like the price, go for it. How many miles on your Scat? I'll probably change mine at 3,000 miles or so then yearly after that.
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