You're welcome. Yes one is a clearomizer with a replaceable head (wick+ coil) inside. The heads can even be rebuilt using Kanthal wire and silica/ cotton or hemp- very economical but you would need a digital multitester. I've been using the same clearomizers for over a year...of course I've been replacing/ rebuilding the heads. Realize there are 2 types of clearos- top coil= warmer vape and bottom coil= cooler vape. It's all personal preference...some LOVE or HATE one or the other.
I find the cartomizer gives a superior vape but the cartomizers are disposable.
Realize also some polycarbonate clearomizers and carto tanks can be damaged by "acidic" juices. That's the reason they came out with metal and glass tanks. Polypropylene clearos/ cart tanks is also supposed to be impervious to damage from acidic juices.
Many diff types of clearomizers and the pics below just shows a basic clearo disassembled.
Top Coil Clearomizer
Bottom Coil Clearomizer
Cartomizer+ Tank
Realize if buying a carto+ tank setup the cartos must be punched/ have holes in them. When I began vaping I started with cartomizers. Within 2 weeks I was using a carto+ tank. When clearomizers were released I began using them. Cartos by themselves are great BUT you have to be careful they don't run dry...thus the carto+ tank setup. Of course there's a learning curve to all the above and some clearomizers require "tweaking".