I can't give a direct answer regarding the difference/similarity of the
two Jet motors. However, as general advice, the CFM and HP ratings
provided for most consumer grade DCs are fairly meaningless. Advertised
CFM numbers are usually based on completely unrestricted airflow, i.e.
with no ducts, filters, etc. Sometimes, they're pure fiction. As a rule
of thumb, under realistic working conditions, most consumer DCs deliver
no more than 50-60% of their rated flow
HP ratings are something of a non-issue, because a blower is basically
a fixed load. It takes a certain amount of HP keep the impeller
spinning at a given airflow. Increasing motor HP above this required
minimum will not increase performance. So don't sweat the motor specs
too much. I agree that the 11A number for the Jet is strange, but this
machine has performed comparably to others in tests, with nothing to
indicate that the motor is underpowered, so I wouldn't worry.
In any case, I'd pick either of the larger machines, whichever comes
with good felt filter bags.