You may have a problem! you need to know how your old key fob was soldered, when you open the rear of the plastic case up you will see lots of solder joints,
there are a bunch of joints 3 X 7(21 joints) in a block, see below
Looking at your old one you need to copy the solder joints so that your new fob is the same, see the example here,
Once the joints are soldered identically, removing any old solder on your new fob from around the joints that are not connected on your old fob you can re-install the battery and then box the case up and it should work :thumbsup.