When I looked inside both tanks, the vintage units were made up of spring sections that had subtly-different thickness and tension on them, while the modern tanks had spring sections that appeared identical. My experience wasn't that the length of the decay or the "quality" of the reverb was different, mainly that resonance and the resulting "tonality" of the reverb. Once I bought a 70s-era Accutronics tank, the Super Reverb again sounded like it should, with the midrange resonance. The resonance was at a higher frequency, and made the overall reverb sound brighter. When I bought a vintage Super Reverb, it had a modern tank in it, and the reverb did not sound like the vintage Pro Reverb I had at the same time.
What I've heard in my vintage Fender amps was the old tanks had a resonance in the midrange, and that really works to become part of the amp's voice for onboard reverb models (Pro Reverb, Super Reverb, Deluxe Reverb, etc). Long story short, before Accutronics was sold to Belton Korea, you had a company that continuously made the reverb tanks from the earliest Fender units until the sale: Hammond -> Gibbs -> Accutronics -> Sound Enhancements were all one company/division of Hammond, spun off and whose name changed over time. My experience is more with tanks older than either of your reissues.
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