about as much difference as lock time, bore axis, and spin drift.
Example for 40° vs 20°,
When using a .22 lr, a subsonic round could become a supersonic round if its cold enough.
The speed of sound is slower in the cold, so maybe that subsonic .22 lr at 1000fps can now break the sound barrier.
This would change trajectory I imagine... Have not tried this theory out, but kind of a fun fact I picked up a while ago.