Mergansers - Common and Red Breasted

Mergansers - Common or Red Breasted. The first 3 photos were taken at the pond on Tierra Verde,

close to St Pete Beach in Florida.
I originally had all these photos grouped together.

But on closer inspection, I think I have the Red Breasted
in the top 3 photos, and the Common in the bottom 3 photos.

The bottom 3 photos were taken at Fort DeSoto Park,
also near St Pete Beach in Florida.

They were taken 3 days apart. Tierra Verde is the small

strip of land you travel to the Fort DeSoto Park.

I know the quality could be better, but I would still appreciate
any clarification of the correct identifications of these Mergansers.