charleski
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They have different OPA: 1612 vs 1642.
The 1642 uses JFETs whereas the 1612 uses bipolar input transistors. They're functionally identical, the 1642 has a higher noise spec, but it's still incredibly low.
One listening test found the 1612 to be more ' "rocky" and forward' and suitable for listening to Springsteen, though you'd want to use a different opamp for Baroque chamber works.
I guess that sums up the value of 'listening tests' for you...