They have twice the number of poles.
So you do not know why? Poles does not add output. Stator and rotor/field density does regardless of number of poles. Also commercial power uses multi-poles not to increase output but rather to reduce RPM required for 60 or 400hz output. (2 pole 3600, 4 pole 1800, 8 pole 900 RPM and so on for 60hz)
The rule of thumb with Alans advice is that all of it is good except much of the stuff he says about power which flies in the face of basic electronics principles and long established fact and practice. I don't know many auto electricians and commercial two way radio installers who would look at his advice on power without a smile on their face.
Alan has huge gaping holes in his knowledge of automobile electrical systems. Unfortunately he has backed himself into a corner where he will not or cannot admit it due to basically becoming the authority on mobile installs in the amateur community. Hell I even had some lid on here send me an abusive personal message because I dare dispute k0bg's "facts" about powering radios and alternators.
In regards to the photo he and I are on about. When it was posted on QRZ he said a 5W HT caused it. Now thats suddenly turned into a CB of unspecified power output.
And I have ALWAYS said that it is safe to power a radio from the cig lighter socket ONLY IF THE WIRING IS RATED FOR IT AS WELL which, at least in European land, it is.
But what the heck, I know nothing. I'm only a qualified electronics engineer with bench experience to component level, a qualified time served mechanic and qualified automotive electrician who has installed pretty much everything you can power from a vehicle including many PMR radio systems.