Almost all "cooled" seats are just ventilated. I can't even think of any that are actually cooled, and the Ram is no exception. Reason being if they hook it up to the air conditioner piping then when you apply heat it would blow heat on you too. Generally speaking they all consist of a fan underneath the seat that pressurizes a perforated air bladder that inflates from under the seat and inflates a bag in the seat and/or seatback.
Aside from body types and clothing making a difference, with heavier passengers and those with tight fitting clothing not feeling the effect as well (heavier and tighter fitting clothing will compress and clog the air bladder you're sitting/leaning on), not all vehicles have the same strength fan. Take like the fan on your laptop and compare that to say the fan on a big data center server, the latter being super loud and probably 50x the hourly flow rate.
The ones on the Ram for example are quite powerful and large, but other manufacturers may put small and/or weaker fans just so they can check the box "ventilated seats" as an option, even though the result is not class leading. Same thing with those AC power outlets for example, the Ram one in the bed may be 1000 watt or so, but then on a Hyundai Santa Cruz pickup its only 150 watt, mostly so they can tick the box "yeah we offer that too", lol!
Be nice if we had a consumer protection agency that required them to list specs like "ventilated seats 800CFM flow with 170lb passenger" or something like that, so we had a benchmark.