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As far as I know, this era of Packards should have an AC filter unit so I can't advise on the Carter type.

Odd as pretty much every Clipper I've seen had this same Carter type, with the short bowl and element.

Since they were technically an accessory (PA455381), perhaps dealers installed the Carter ones as they made better margins on them. Similar to why they always used those Yankee mirrors instead of Packards own.

Also, for reference, the number on top of the Carter is their general patent number and has no relevance to the actual model of the unit.

As the fuel pump was AC and the filter was an accessory to the fuel system, AC would make more sense. However, by now and with the Carter type possibly being more commonly available over the years, it would be very possible for many cars to have since been fitted with it. I used to have quite a few of them new in the box that I bought from a local auto parts store. My 1956 Clipper has Carter but it also has a Carter pump. For the earlier cars, though, the two are totally interchangeable as an assembly so it matters little which it has other than in knowing which element to use!