I suspect the biggest difference between numbers would be in jet size and adjustments that were specified by the various mfgs engineering depts to be optimized for the engine it was going on.
The correct WDO carb core for your model Packard should be available relatively inexpensively from those on the forum with parts cars or some of our used vendors. If you are handy and a bit mechanically inclined rebuild kits are also easily found. You could probably do something like that for far less than the cost of a professionally done rebuild.
Another option which recently came on the market is a replacement universal 2 barrel carb from
Daytona Parts. Daytona has been around for years and has done rebuilds for many of us. Their new carb may or may not need some kind of adapter to bolt to the manifold but from the description and the fact it is a new carb it might be worth looking into. I expect the price would be in the same neighborhood as a rebuilt original though.
Aside from the visual differences, probably the biggest downside to going with a universal carb is you would need to add a pushbutton to start the engine as the accelerator pedal carb start switch would no longer be there.
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