V4 power requirement is 5V 1 amp which is the same as V3. In theory, the V4 should work in the auxiliary USB Type -A port on the Floodlight. IRRC, that port is capable push up to 5V 2 amps. @carverofchoice mentioned about powering a Eufy camera + Wyze V2 using a splitter cable here.
You can check out the discussion on this particular thread.
@DannyQ confirmed he was able to power a V4 on the secondary USB port on the Floodlight V1.