do i need noc to apply same company to change position??

hi i need your advice please answer me.

6 months before i worked at A company in qatar for 2 months.

i changed my passport and i applied different position at A company again.

it seemed they don't know that i worked before.

now they gave me visa and ticket.

when i go to qatar, do i get in trouble??

some people said, after 6 months will be okay.

please give any opinion ...