ATF is not just simply oil, there about 100 types of proprietary blends of ATF now, these blends are called highly friction modified ATF, they actually change the slip and friction charecteristics of the fluid which is blended to work in perfect harmony with the transmission shift system. e.g. Toyota T-IV is not replaceable with ZIC dexron 3 - both look the same, both smell the same but using the ZIC will cause noise and erratic shift behaviour which will lead to early death of the transmission.
There are additives (but not in Pakistan) that can convert an ATF to HFM ATF - but as they are not available there - dont even try to use a plain ATF in a box that requires a special blend.