You’ll want to plan to go through the bonding steps with them but they may fall in love right away. You might want to consider keeping them apart until both are neutered/spayed because you will have to separate them again for her surgery, and because she will likely get pretty nutty (moody, territorial, etc) once her hormones kick in. If they are together while her hormones are crazy, they could end up fighting and making re-bonding difficult.
I had my bonded babies (half-siblings born a few days apart but kept together) spayed/neutered at the same time for just these reasons. We kept them in separate cages (right next to each other) for awhile even after they healed and hormones dissipated due to space issues, but let them have play time together starting a couple weeks after surgery (we didn’t know at the time to wait 4 to 6 weeks). Ours did fine, and were thrilled to see each other.