What if any is the difference between diltiazem we and diltiazem cd?

Pharmacokinetics: CArdizem CD basically is long acting. Typically this form is to be taken once/day as it is supposed to give you coverage for 24 hours. The other one, by "we" I think you mean short-acting Cardizem (typically comes in 30 mg and 60 mg tablets), is short-acting, and faster acting, but out of systems usually within 6 hrs, so in some cases can be give three or 4 times/day. Active ingredient same.