changing the double light switch for a light and extractor fan?

I'm changing the light switch in kitchen, on the old light switch there is six holes for wires (excluding the earth) the hole are identified as follows A, B1, B2. and along the bottom A, A2, B. the problem is the new switch i have has six holes but they are identified as com, L2, L1 and along the bottom L2 L1 and com......do i have the right switch and if so how do the old letter and numbers correspond to the new ones?