Which dreadclaw does the Horus Heresy Legends refer to?

Hello everyone! Pretty new to warhammer , the lore , and basically everything about this hobby. I was wanting to convert a space marines drop pod into a dreadclaw to use for my leviathan dreadnought (after learning I could), but when I search dreadclaw I see a lot of different variations? Which one does the Horus heresy legends list refer to . I’m guessing the first 2 images are the same, after doing some digging I saw that the last is called an anvillus, so are they all usable as “dreadclaw” or are the sizes too different.