These aircraft had me confused and the profiles for the two didn't help any. I have just finished communicating with the Kalamazoo Aviation History Museum to sort these.
The bottom profile is the only one which should be linked to N28PU. The aircraft in the Museum was N2PP until retiring from flying status - all photos of this aircraft on the top profile need to be moved to the bottom one. When N2PP went off flying status, a friend/pilot wanted to keep the number active and so had his aircraft registered as N2PP and painted the same, and the Museum's bird is now N28PU.
So, c/n 75-3412 N2PP is the current one and should not be linked to N28PU. The old N2PP, c/n 75-5736 is now N28PU and should be linked to that profile.
Although N28PU shows N2PP on the fuselage, I'm moving my photos to N28PU because that is its actual call sign. But Mark and Daniel's photos should be at least moved to the older profile for N2PP.