Marantz 8b - 4 Ohm vrs. 8 ohm tap - power loss?

Has anyone used an 8b’s 4 ohm tap with 4 ohm speakers? Compared with using the 8 ohm tap and 8 ohm speakers is there a power loss using the 4 ohm tap?

I don’t see any published specs showing the power output wattage at 4 ohm’s compared to 8 ohm’s. 
 

Thanks