Museums don't always get it right. Not many Me410s around. Supposing they were missing one or both props to begin with, most museums would stick a replacement on there.
So don't go by what you see in the museum, go by the photo you have. That is the standard blade type for the Me410 in every photo I've seen. Ignore the museum with regards to finer details. I've read that many people were absolutely convinced the Me109E had a gun firing through the prop because they looked down the nose of one in a museum and saw it. In reality this was never the case. The engine setup and vibrations caused the guns to jam and they were removed after the testing stage. However, a museum putting together a display won't mind putting it in there. It looks good, it captures the imagination, etc. I don't hold it against them or anything. You just can't take their setups as gospel.