so, perhaps the primaries are smaller on the 2.5 but the secondaries are the same as the 3.2?
one thing to note is that some ROW markets don't have cats on the headers of the 3.2 (ie, australia, germany) and the headers they use look suspiciaously like the 2.5 headers. here are some comparative images:
and
one is for a 2.5, one is for a german 3.2. differences?