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Yes, that is right. In the male you clearly see the genitals, forming a big knob at the end of the abdomen.
Where Sph. scripta males also differs from similar species in the length of their abdomen (clearly longer than wings when stretched along the abdomen), most other Spaerophoria species can only be differentiated with certainty by looking at the genitals. The genitals can be preparated quite easily.
Females of most other Sphaerophoria-species can not or only hardly be separated from eachother (only scripta, loewi, rueppellii and estebani can be differentiated with certainty from other species).