Question about rims for LML Star 125 4T

Hi I have to order a rim for my LML Star 125 4T.

I already have 2 tubeless rim now I have to buy the third rim for a tyre with tube.

I'm not sure if those two models fit in my LML

Art.No. 81031000

and

Art.No. 81020000 

According to what I understood they are the same the only thing that changes is the color "titanium gray" for the first article 81031000 and chrome 81020000

Is the color the only difference?

I'm not sure about size and stuff like that 

Can you please confirme me that both types fit in my LML Star 125 4T ?

And also can you confirm that the rim is easy to divide in two part as shown in the video?

Thank you very much