The taller ones seem to be spread more at the , generally. Need more examples and some labelled ones could help too. Noticed a remark on DG site that height varies on degree of spread. Did NM make more than one size?
I guess Emil's that started this thread is possibly NM note that one is 26cm.
Libochovice pattern 1584 had spread at 25cm slimmer at 16cm
Rosice pattern 2472 slimmer 25cm
New Martinville pattern 101 (Morning Dove) (Advert states 9" - 23cm, DG site states 25cm/10" citing spread for height variants)
Degrees of spreading may vary, top rims may vary. Frosting of birds DID vary, colours... lots from all 3 makers.