Scenario A. Gas heat Midwest. Load the US gas preset. Bill and footprint both sit near the US baseline, so divergence is small. That is agreement. Still useful as a control.
Bill vs footprint appears when you change only the region chip, not when you rewrite every kWh field.
Scenario B. All-electric France. Same style of electric heat loads on a nuclear-lean grid: footprint Δ% should fall hard while the bill may stay elevated versus US rates. Divergence pp is the teaching number.
Scenario C. Australia + AC. Cooling-heavy loads on a carbon-heavy grid: footprint can outrun the bill story. Cost leader and carbon leader may also disagree across slices.
Scenario D. High fixed charge. California-style rates plus a large monthly fixed fee: dollars rise with little carbon movement. Bill vs kWh×rate sits beside Bill vs footprint.