I have no idea on Taca Peru Intl and Saeta
But Latinpass answered 1 of my emails that
said as long as I booked and had tickets issued before they started flying ...Latinpass would honor the flights as substitutes...

But being a bit "cautious" I'd ask them again since their Taca Peru answer was a "bit" vague. Let us know what you find out.

I'd suggest an email since it's more easily
returned to them if questions arise later.