Just to be a helpful genetics nerd, the cross is Pineapple Trainwreck x Cookie Monster. PT is Pineapple Express x Trainwreck, and CM is Girl Scout Cookies x Purple Panty Dropper. I’ve not grown Pineapple Upside Down Cake, but had excellent results growing HSC’s Trainwreck and Cookie Monster, both strains from seeds though.
I’m definitely keen to see how your clones turn out - I’ve heard lots of buzz about PUDC. Good luck with your grow!