Not very obvious, to be honest, but there are subtle differences in the new figure (on the right).
Take a look at the close-up pics..
You can see the mud splatter on some of his clothes and a ice effect on certain parts. The eye scar evident on this figure confirms it to be Kuai Liang, the younger Sub-Zero. Which is actually very cool (Pardon the pun!). Not many figure companies have actually made 2 Sub-Zero figures that represent the brothers.
That's 1 reason for having to own both!
However, that alone isn't going to convince collectors to get a 2nd Sub-Zero figure so here's some more cool stuff!
A frozen Kung Lao head! That is just sick! One of the main features of the World Box's 1/6 figure line is the inclusion of Fatality accesories, which are incredible!
Another reason to own this Sub-Zero figure even if you have the original.
If you missed the first one and can only choose either, this should definitely be the better option, showing off Sub-Zero's ice powers.
Here's a reference of the original Sub-Zero's accessories.
Come to think of it.. not 100% better. How could you miss out the Spine Rip fatality??!!
I was a little skeptical about the "variant" figure but looks like they have convinced me, regarding the Brother that I should get both.
For upcoming figures, I would prefer to see new characters rather than "variants" but I would love to see 'accessory packs' where they give us more accessories to use with our current figures.
It's taking a long while for World Box to churn out these figures but I'm hoping that we aren't reaching the end anytime soon.