The only real differences between the Slingerland and Leedy snares during the SlingerLeedy era was the strainer and the lugs. Other than that, they both used the same 3 ply shells, tension rods, hoops, mufflers and badge grommets. The two brands had differing wrap and duco colors as well. I don't think they ever cataloged a solid maple shell Leedy snare.
In catalog 62 Leedy offered, in the catalog anyway, the Shelly Mann snare with either the Slingerland three point with no extension bridges or the Leedy Broadway strainer with had the built in bridges. The 4 1/2" got the Slingerland three point.
I believe the Zoomatic was introduced in catalog 63 so in '62, the higher end Slingerlands would still be suffering with the Clamshell strainer on the Gene Krupa models.