I don’t think it’s the same Sub ?
The second site is super technical
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I read some comments about the "revised" version a while back and came away with the impression they were more cosmetic than a real re-design. Been a while, tho. It should be close enough.
You should use that site, it is literally (only really) the best 3rd party site for sub testing out there. Josh Ricci is the man. There's a lot to learn there, good articles as to how subs are measured and what those measurements mean, more tests/results than you'll see from any manufacturer plus his perspective having sampled (and built) so many. Start with the myths from that site here
http://data-bass.com/data?page=knowhow&type=1
ps It's probably a decent entry level sub, especially if you get a significant discount on it to boot which I think is fairly easily done.