C391B vs C451B

mandocaster

non compos mentis
I just won an AKG C391B on Ebay ($179). It appears to be similar to the C451B, in that it is a self polarized (I think this means back-plate electret) SDC. It has interchangeable capsules, and comes with the CK91 cardioid capsule.

Anyone have a chance to compare the two?
 
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