I know you all are speaking in jest regarding Peg's Sal's fig -- but Herman, Jon and Peg all got their Sal's from me (Herman and Jon via Leon), so any differences can be marked up to climate or an insufficient number of leaf samples.
Yes, any one tree has variously shaped leaves, which makes comparison difficult -- but not impossible when done thoroughly. Any one variety tends to have about 3 general leaf types: 1 juvenile and 2 mature. Hardy Chicago and Sal's EL leaves are very similar; except for one of Sal's mature leaf types which is very distinct from any that HC has. It’s much broader/fatter than the others.