Finally got my little grubbies on a REAL 435BE . Heres my observations between the two;
BOTH have ferro fluid.
Both appear as identical drivers in EVERY way.
Diaphragms do interchange and appear identical in every regard excepting that: the 435BE has a black coating on the front of the diaphragm and is bare on the back:
the 2435HPL is a bare diaphragm on both sides.