The way they differ is in their positional archetypes. Bogdan is a combo guard with a nice off-the-dribble game. He can shoot, pass, and can be a defensive pest on the perimeter sometimes. Bogdan is a legit terror on the perimeter, and inside the 3-point line his pull-up chops and passing skills synergize to make the defense really react to his attack. He's not particularly strong or athletic though. So far in these playoffs, it's felt more highlighted that he's only really dangerous on the perimeter. Once he gets into the teeth of the defense, he doesn't have the athleticism to generate a ton of scoring there.
Bojan is a combo forward, is bigger, and uses that size to post up and work out of the high post. He's physical and can get to the line. On the perimeter he's more of a c&s type than a ball handler. He's pretty good at staying in front of larger slashers, though I do think he's slowing down on that end. Bojan's scoring is a little more durable than Bogdan's because of that size and strength.
I don't think there's a meaningful enough gap between the two. You'd want Bogdan is you need a guard, and Bojan if you needed a forward. Both give you a great shooting threat with some bonus all-around game. Bogdan is younger, had a better season this year, and would be the better pick I think if you were signing him today. Bojan has been very good for at least 4 years, and has had the better career thus far.