According to this https://www.error-ref.com/die_crack...__pre-cud__/ a rim to rim die crack and pre-cud are the same thing. It goes on to say "The die crack shows only lateral spread. The presence of either vertical displacement or horizontal offset would indicate the presence of a Retained Cud." It seem to me that " Retained Cud" and "retained broken die" also mean the same thing. So from that, the question is whether or not your coin shows vertical displacement or horizontal offset. If it doesn't, it's a rim to rim die crack.