one degree of inclination difference with otherwise similar orbital elements upon impact translates to about .5%-1% of energy of a head-on/t-bone impact. at orbital velocities this is still mindblowingly devastating. you've basically reduced a 8km/s impact into a 40-80m/s which is in 90-180mph range. result is lots of debris created in both orbital planes as both sats (you're comparing cars, so i assume you want sat-sat impact) are totalled, solar panels shattered, etc.
and that's basically the smallest accidental collision in space you can imagine (not counting failed berthings/dockings and the like).
and that's basically the smallest accidental collision in space you can imagine (not counting failed berthings/dockings and the like).