Thanks guys. And Christian, yes these were a pleasant find and I hope they stack up size wise with Pulp Figures and Copplestone.
I've got loads of Pulp Figures, other Brigade sculpts (although not these Arabs) and some Copplestone, and they generally go perfectly together. Mind you, Brigade uses more than one sculptor, and some of Copplestone's stuff (the damn Brits!) is out of line, but generally you should be fine. As you said, shim the bases if it's really an issue of them being short.