can I flash stock sony z2 ROM on my Xolo play 1100 directly
Please don't do it, unless you were born with the golden spoon in your mouth. Ok on serious note, flashing different device's ROM to another device, will NOT work. It will brick your device. Once I flashed GT-S5570i ROM on GT-5570, My phone was dead, I thought a small "i" wont matter..But it did.

Look Here.