I think it’s one of those coolants that has a close formulation do DC, but not exact. Much like DC and the newer Mopar coolant. Close, but not exact. Heck, it could be a G05 clone. How would you know.
I’d run a coolant marketed as Dexcool.
You would know it's an OAT or Dexclone coolant made by Old World Industries (aka Peak) by looking for the SDS
So you can rest assured it won't be a problem. The modern AMAM type coolants are dyed flourescent green or yellow so that they won't change the colour of the factory coolant, so if you add it to a Dexcool filled system it'll retain it's proper orange colour.