Cage for server ML350 G9 (P/N: 765820-421)

Hello.

I wouldneedhelp with theexpansion ofbasicserver configurationML350G9 from the original 8xSFFHDDto16SFFHDD=> Howto use thecage?

I looked at the accessories and offers two version:

   1.) HP ML350 Gen9 SFF Media Cage Kit(726545-B21)

         http://www8.hp.com/cz/cs/products/oas/product-detail.html?oid=7242892#!tab=features

   2.)HP ML350 Gen9 8 Small Form Factor (SFF) Hard Drive Cage Kit(778157-B21)

        http://www8.hp.com/cz/cs/products/oas/product-detail.html?oid=7139521#!tab=features

I received from a supplier cheaper version Media Cage Kit(726545-B21) => substitute for another

Please what is the difference between the two versions?  And can be used cheaper version Media Cage Kit in my situation if I want to expand on another server RAID controller (P440/4GB FBWC) and more SSD HDD ??

Thank You. Josef K.