Do Muslims and Catholics go to the same heaven?

My only little brother (only sibling period) died last year, and had a catholic m and funeral. Me and my brother were raised Catholic but have not actively been members/regularly attended for years now. My parents are confirmed Catholics, me and my brother are not. I am soon converting to Islam and am concerned (seriously,deeply) about not seeing my brother in the afterlife. With me living a life as a devout Muslim, will my brother who never embraced Islam not be able to see me again. I believe without doubt, with every fiber of my being, without a hint of uncertainty that my Brothers soul is in heaven. Just concerned that with changing religion I will be in a different heaven one day and not be able to be a family again with him. I am very serious about this, my brother died in a alcohol related accident and his ping has completely destroyed me. It is because of his ping and the cirstances of his accident that I am changing religions. I am doing what I believe what is best for my future children, and to make sure they have superior values instilled in them, preventing what happened to my brother happening again. I welcome your opinion.