Prestone Extended Life Coolant... Re-flush?

[Gergify]

So I was doing my post 100k tune up which included a coolant change. Having never owned anything newer than 15+ years, I was surprised to find crystal clear coolant (pink) pour out. Guess it didn't need to be changed......

I had bought Prestone Extended life (green, no silicates). I had no choice but to run a few gals of distilled water through and add it, as I needed to car and the dealership was closed.

Now the internet has gotten me paranoid that I have done some irreversible damage to my coolant system. I can't seem to find any concrete info. Some people say you can only use the OEM toyota stuff, some people say it really doesn't matter as they are all basically the same.

Should I bite the bullet, reflush and add Toyota coolant? Or am I good with the Prestone until the next change?