I had spoiled 2 lipo batteries
1) 3s 1600mah Turnigy
2) 3s 2300mah Indpower.
Here i lost 1 cell in each LiPo..
I am deciding to make a new lipo pack with the remaining 4 cells, was wondering will it be ok if i mix two different ampere rating of the batteries?
1) Is it safe or unsafe?
2) What are the things i need to take care while doing this?
3) Is there any advantage or disadvantage?

1) Completely unsafe.
2) Don't do it.
3) Disadvantages only.

In short, no. 2 different capacities by 2 manufacturers...

One cell will get depleted before the other. Packs need to have matched internal resistances.