Ford's use of the term modular means the same short block but with many trim levels. Think of how many differant applications there of the 4.6L and 5.4L Modular motors...
4.6L: SOHC 2v Car, SOHC 2v Truck, SOHC 3v Car, DOHC 4v Car, DOHC 4v Intercooled S/C'd
5.4L: SOHC 2v Truck, SOHC 2v Intercooled S/C'd, DOHC 4v Car, DOHC 4v Truck, DOHC 4v Intercooled S/C'd.
At least five trim level at all are based on the same block, but differant trim levels.