Looks like a definite case of a bribe. Both unit types can be recruited by just about every faction (incl Saba). With diplomats roaming the map and bribing one anothers stacks that might be a "vicar of Bray" army:could've started out as Sweboz, bribed in turn by Averni, Romani, Karthadastim, Ptollie and then Saba...or not.
As for this business of being able to bribe units you can't recruit, I'm yet to see it. I tried to bribe a unit of Irish heavies that spawned as brigands in Kruddain in my current Casse campaign but they would not join me. Dammit.
(edit) actually come to think of it I didn't have enough money so i terminated them. Maybe I'll save up in case another one appears...heh heh heh...
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