Using a Fluke 117 multimeter set to auto-ohms, I measured the loop resistance of several Multi-Comp cables. Each cable was bridged at the far end so the meter measured the total resistance of both conductors.
Test results
Multi-Comp Pro 2413857, 3 m: 1.0 Ω | 1.3 Ω | 1.5 Ω | 1.1 Ω (1.2Ω mean)
Multi-Comp Pro 2 m: 1.0 Ω | 0.9 Ω | 0.8 Ω | 0.6 Ω (mean 0.83Ω)
Summary
With a burden resistance of approximately 20 Ω, the measured cable resistance is relatively small, approximately 1/20 = 5%, but worth allowing for.