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Originally Posted by Mister_M

They are all grey with camo skin ("dazzle").

It is my impression that dazzle camoufflages were only used on naval and auxiliary vessels, or at least I have never seen a merchant ship in complex camo scheme. To me, only the ship on the right has a dazzle pattern painted on her hull and I suspect her to be an auxiliary, but again my eyes are not very sharp

Originally Posted by Mister_M

Perhaps a slow convoy with old steam ships still burning coal (they have a stern of the old type), small ships of less value which are not worth to camouflage with grey paint...

https://www.history.navy.mil/content...1772365144.jpg (from here : https://www.history.navy.mil/researc...ip-shapes.html)

Yes, from their look those are definitely not "modern" freighters. As for them not being worth a dozen cans of grey paint, well, according to one of the posters in the forum thread I linked at post #1, a decent grey coat could be obtained by mixing black and white paint, which for sure wasn't in short supply at that time