Yes these motors can be setup to handle cone arbors. If the HP,
RPM, bearing type, ampere rating, and seals are the same, then
yes, they are technically the same. Look for sealed ball bearings
for the best lifecycle. Sleeve bearings are as they sound, a
simple brass sleeve open to all the dust you can throw at it.
Motors are also rated as to their ability to withstand hard use,
called a service factor. Look for at least a 1 service factor.
The higher the better but for most general applications a one
will be sufficient.
All motors(with like specs and factors) are not created equal.
But I have seen some brands of good old ( usually newer)
American motors fail as quick as a cheap import. I can’t go
into all the detail here. But I think since the load on a motor
for buffing and polishing is relatively low, you will be OK with
a lesser brand name for general shop use. Of course if you will
tax the motor hard day in and day out, then it would probably be
worth the investment in a heavy duty motor with a high service
Most grinder/buffer motors are about 3600rpm, capacitor start,
HP from 1/4 to 1., with sealed bearings. Dust collection is a
big plus. Shields are necessary for safety. The type of base
is a major consideration as this dictates the installed height
as well as other mounting factors. A 1/4 hp motor is not well
suited for heavy shop use. 3/4 hp has fit all my needs over the
years. Hope this helps some.