kohler 775 EFI coolant

[plott hound]

so 2 years ago when i stipped down my argo HDI i had the engine out of it and figured might as well change the coolant.i put prestone cor guard in it since its supposed to be compatible with any antifreeze.so the other day it dawned on me that not all antifreeze is created equal and some types are corrosive when mixed.the coolant i removed was green and this prestone cor guard is orange.should i be flushing this orange koolaide out and putting in the green stuff or am i ok?

thanks .