Is a Cat and a PBY the same thing, or just planes with some similarities?

Thanks Frank and Charlie for the stock info. I was really questioning the one that looks like it bounced, it looks almost like ink instead of a stamp - very faint. Here's some more pictures. I can't see anything in the ink of the slide channel other than it's there. I can see the RSG in one sling well, and RS for sure in the other - maybe something after the RS? I've got a repair on one of these that I'm going to wait awhile before showing the picture - it's kind of ugly! - Bob
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