It's not a lion's roar for sure and the F-35 was involved. For detail take the word of God from the Hollywood Reporter:
Did you use other archival elements from the animated movie?
There's a moment where Simba roars and we think, "My God, how did he
make that sound?" and we come to discover it's Mufasa. And Jon said,
"In that scene, I think they ...
I can remember, that when the game Kinect Star Wars was dubbed to Polish, the lines where dubbed, but laughter was kept original. And it looked and sounded very bad.
Answering your question: this depends on two factors.
Firstly, was the sneeze originally recorded as part of the dialog lines, by the artist, or was it recorded as a sound effect by foley ...