I said "in some instances" and "virtually". I'd agree that there are many models that are not similar, apart from perhaps headstocks shape, but there are some that are really quite close.
https://images.app.goo.gl/EWi7fmjB7zqZzLDi9
https://www.ebay.co.uk/itm/156645723240?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=lzb7hzhfthw&sssrc=4429486&ssuid=FrF8PzSQTWO&var=&widget_ver=artemis&media=COPY
The main functional difference is the location of the jack socket, plus one has the pickup poles flipped (easily changed). One looks much better, though, assuming you like white pickup covers. Granted, the Thunders with exposed pole Magnatone style pickups seem to be relatively rare, but I don't think there's much difference other that pole visibility to the enclosed type, and there are a few variants of those.
Whilst there's no exact analogue in the Westone catalogue for the Arias most favoured in the 1980s, the cachet of appearances on Top of the Pops seems to have attached to the whole brand, including models that didn't feature on TV often or at all. The layer Thunder II or III can probably get you close to the John Taylor sound. I had a III with Magnatones which seemed to do the job reasonably well and looked suitably 80s. However, there was a fault somewhere so some switch combinations didn't work so I sold it.
I had a West one Thunder IA fretless, circa 86-87 build, sold it, and more recently picked up one of similar vintage fretted, both with Magnatones. In the end I decided that the pickup in roughly the MM position wasn't getting me the sound I wanted. I just sold my MM SUB for the same reason. The Thunder III I could probably fix now, and I wish I'd kept it.