As far as I know, all are interchangeable. The two kinds require different angled hoses, as obvious in the pictures. I don't know, but I assume the cable angle/attachment is the same, or at least easily adjusted.
The first picture does have a thermostat, which I am coming to think I need to fit on mine, which has the second type. Not having a thermostat is useless - mine basically has only an on/off. It's either full on, or off. Even the tiniest movement of the lever turns it fully on.
Also the second kind are flimsy plastic and notoriously prone to leaking.
If I do swap to the earlier thermostat kind, I'm unsure where the sensor coil should go. Commonsense says you need it in the footwell, but an earlier car of mine had it poking inside the heater duct. That doesn't seem to me to be controlling the actual interior air temperature, unless there is some subtlety I don't understand.
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