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We compare infrared surface brightness fluctuation (IR SBF) distancesmeasured in galaxies that have hosted type Ia supernovae (SNIa) to distancesestimated from SNIa light curve fits. We show that the properties of SNIa foundin IR SBF hosts are very different from those exploding in Cepheid calibrators,therefore, this is a direct test of systematic uncertainties on estimation ofthe Hubble constant (Ho) using supernovae. The IR SBF results from Jensen etal. (2021; arXiv:2105.08299) provide a large and uniformly measured sample ofIR SBF distances which we directly compare with distances to 25 SNIa hostgalaxies. We divide the Hubble flow SNIa into sub-samples that best match thedivergent supernova properties seen in the IR SBF hosts and Cepheid hosts. Wefurther divide the SNIa into a sample with light curve widths and host massesthat are congruent to those found in the SBF-calibrated hosts. We refit thelight curve stretch and color correlations with luminosity, and use theserevised parameters to calibrate the Hubble flow supernovae with IR SBFcalibrators. Relative to the Hubble flow, the average calibrator distancemoduli vary by 0.03mag depending on the SNIa subsamples examined and this addsa 1.8% systematic uncertainty to our Hubble constant estimate. Based on the IRSBF calibrators, Ho=74.6$\pm$0.9(stat)$\pm$ 2.7(syst) km/s/Mpc, which isconsistent with the Hubble constant derived from supernovae calibrated fromCepheid variables. We conclude that IR SBF provides reliable calibration ofSNIa with a precision comparable to Cepheid calibrators, and with a significantsaving in telescope time.

Connecting Infrared Surface Brightness Fluctuation Distances to Type Ia Supernova Hosts: Testing the Top Rung of the Distance Ladder