Is it possible to play different songs on a HomePod and a HomePod mini at the same time with a single Apple Music account?

I have a HomePod set up in my office and a HomePod mini outdoors; I tried playing one song in HomePod and simultaneously wanted to play a different song in HomePod mini requesting Siri to do so from my Apple Music account. The office's HomePod paused when starting to play in the outdoor's mini, WHY?

Could it be that it's the same Apple Music account?

Tried to play HomePod with Apple Music and airplayed Spotify to the mini and this WAS possible, but I would like to play both HomePods on different locations with different songs at the same time directly from Apple Music. How can I make this possible?