No, that isn't correct.
Aldactone is spirolactone, a potassium sparing diuretic (actually an aldosterone blocking agent)
Hydrochlorathorazide is a thiazide drug that will make you excrete sodium and potassium. The combination of these two drugs is Aldactazide, not diazide.
Diazide is a combo of triamterene , a potassium sparing diuretic, and hydrochlorathorizide. Triamterene elicits a stronger diuretic response then aldactone, so diazide is a stronger drug then aldactazide.
Many people like both these combos. I prefer aldactazide, I think it gives the most diuress with the least amount of potassium lost (thus less lie\kely you will o.d and cramp or go flat)