The two test conditions offered suggest an exponential/logarithmic relationship between Delta Icc and Vcc; increasing Vcc by a factor of roughly 3 adds on two decimal places to the quoted Delta Icc figure.
Using some (very) rough guesstimation I’d throw my dart at Delta Icc being around 0.1mA @ 3.3v Vcc. Over-safe route would be to design using the Delta Icc figure given for 5v. Characterizing the device yourself under the anticipated use conditions would give better-informed results.