New And Little Confused Redmi 2gb

May 2, 2013

I just got my first xiaomi, is a 2Gb model 2014813 and seems chines from model n.
Not sure witch rom is on, is in english but i found some strange apps like mabomarket

under info it says Miui version (KHJCNBK) stable
play store is installed

before going further i would like to know if i need to change ROM
can i use same rom, guides as for 1Gb model?

to make a nandroid backup do i need to flash a different recovery?
can't i use some play store app?