either size will and does usually grow and does well but the differance is usually the amount of water that the plant recieved while in bloom

Thanks! I've never seen such big 4 o'clock seeds before. Gotto go out and harvest them this evening.

ProudGM,
Sometimes seed do vary in size and/or color. More important is that they are hard, plump, and not crushable for round seed or bendable for long seed. Easily crushed seed is a sure sign that they are not viable.
Remy