Well I searched the net and i found out this:
Logically both study the same courses and subjects but with the difference of name and code of subjects, as both qualifications follow IAS, IFRSs issued by IASB.
The only difference is the name and the rest are rumours to make ACCA flop in competition with CA
For attaining CA qualification it is a must that you should intern at a accountancy practice while you are studying. But for ACCA you can gain your practical experience as you like.
And other thing is that ACCA has somewhat wider acceptance globally. But CA is considered more "prestigious"