How to watch in the UK/confused by Amazon prime listings

Hey,

I'm just looking at starting a rewatch or korra after just finishing avatar last air bender on netflix. It's been quite a long time since I watched korra so I can't really remember it.

I know it's not available on any streaming services really (expect paramount but I cba with another subscription) I'm looking on Amazon prime, and I'm a bit confused.

When searching two different listings for "the legend of korra" appears. Online it says there's 52 episodes of korra in total over 4 seasons.

However when looking at one listing, it has 52 episodes over two seasons (1&2) or the other listing has quite a few more episodes, but only has season 2, 3, and 4.

I'm a bit confused, and don't want to purchase it and waste money if I purchase the wrong thing.

Can anyone confirm what the difference is? Or which one the correct one is to buy?.

Thanks in advance!