There are 2 standards in integrated headsets, 36x45deg (FSA) and 45x45deg (Campagnolo)

You will need a fork that is made for integrated head sets that has a 45 mm fork crown diameter (so it matches your frame). You can measure the OD of your head tube to check and make sure its 45mm but if it came with an IS-2 (FSA standard) it will.

The fork steering tube will be 30 mm where the "crown race" sits and you can remove this from the old fork and use it on your new fork. Any bike shop can do an off-on for you.

The rake on your old fork is probably 45 . If you try a 43 it may "work" or it may cause the front tire to hit the frame depending how tight the frame was designed.

You will need a new "star nut" for your new fork if it has an aluminum steering tube. If the tube is carbon you'll need to get an expanding plug for it.