clio 3 master brake cylinder

[bozothenutter]

hi,

been looking at several autopartssites at a MBC for a Clio3 RS and they come up with two parts like these:

http://www.mister-auto.co.uk/en/mas...-1-cr0-1-2-0-16v-sport-197hp_v19355_g258.html

what is the difference?
and would it matter which one i choose for a 182 with R26 brakes