Originally Posted by quadsbaby

Yes.

Wiper Fluid = Water, Alcohol (either isopropanol, methanol, or ethanol), and often Ethylene Glycol (to keep the wiper fluid from freezing in colder climates).

Engine Coolant = either Ethylene Glycol or Propylene Glycol or Organic Acid + Corrosion inhibitors... very rarely (I think mostly in the UK now, methanol is used as a substitute for glycols).

Engine Coolant is a subset of Antifreeze, so not all antifreeze is considered engine coolant. Given the way the OP described it, I assumed he meant antifreeze wiper fluid, which would be Methanol + Ethylene Glycol, which would be fine for his engine coolant as the added methanol's not going to really be a problem. Even if he used wiper fluid without antifreeze, it's still not a huge problem as long as it's just a top off.