Platinum Pass perks at other CF parks?

I'm visiting CGA & Knott's next month, and I'll require FL+, parking and haunt passes at both. I may just visit CP & KI next spring, not sure. I What discounts/perks does a CP Platinum Pass give? A 2019 pass nets me one free visit this year, but is that only at CP? I'm in Italy; would I have to submit a photo online during the purchase? Cheers

FP+ is diff depending on the park.

Example, Knotts has one level of FP which covers the roller coasters. They dont have the barcodes like CP. But you dont get the flat rides like CP.