A part both being cis males no. They're completely different, not only from a physical and class point of view but also their character is different, Allistaire was naive, an idealist, in Dragon Age Origins you could harden him getting rid of his most soft aspects.
Gale seems more aware of the ways of the world, he doesn't show the need to become more harsh and cold.
Oh and lets not forget the fact that Allistaire was immune to the herosexual trend.
That's a mouthful. Ali like Muhammad and stair like stairs.
