
The identification of the other terracotta head with Philip is more dubious as it looks like a generic type to me.
The identification of the female terracotta head with the Persephone in the Amphipolis mosaic is completely wrong though. The Juno terracotta head is a mature woman, the Persephone a young woman. There must be at least 15 years age difference there. Again, you seem to be just confusing a vague generic resemblance with actual portraits, whereas the images are very likely not meant to be portraits of specific people.
The biggest flaw in the whole scenario though is that you have not presented any evidence whatsoever to prove that the artefacts in the Falerri museum have any connection with Amphipolis. Until you can make a positive link your theory has no proof. It is also highly unlikely that 3 items taken from the same place in Macedonia would remain together 2,000 years later in Italy.