Both have a 3mm inner dia. .8-9Ω Kanthal Clapton at around 30-35W with the standard caps, on the biggest hole cartridge.
The slam cap doesn't actually reduce the internal capacity of the atty from what I have read, it's purely for aesthetic purposes which is why I haven't bought one.
I'm thinking about popping in a smaller cassette though, after enjoying the tighter draw of the C-Roll. I icked the larger one because I was concerned about the cap getting too hot but that hasn't even been a slight issue.