I calculated a simple example. Two objects are in a circular low orbit but in different planes. The impact velocity depends on the angle between the orbit planes. I use 7.8 km/s for the speed in orbit.
For an angle of 5° the vectorial velocity difference is 0.34 km/s, for 10 ° 0.68 km/s, for 15 ° 1.02 km/s, for 30 °2.02 km/s, for 45 ° 2.98 km/s and for 90 ° 5.52 km/s.
Two orbits with an angle difference of 45 ° to the equatorial plane in oppositional directions have an angle difference of 90 ° between them.
Impact velocities of 1 to 5 km/s are possible.
Uwe
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