Brian,
I didn't look at the coal loads and yes they may be different days but I think they are the same time period being the same week month or what have you. You'd think if one picture was taken there would be at least one more, but could have been a one picture deal from someone getting off the San Juan. Never know.
As far as I know all the K-28's came back intact as they were supposed to go back to the Grande but were refused and scrapped in Seattle. I think the 472 actually made it back but was in such bad shape it was scrapped and the story is her boiler exists in Pueblo or did exist? I'm sketchy on those details. But I have seen pics posted here on this site of the 28's back on the mainland.
William
aka drgwk37