I found this difference or variety on the 1974s lincoln penny. In some of them the 1 and 4 are higher and in others they are even al 4 digits
ODV-030 (Revised portrait, Thick Date) Philadelphia Denver San Francisco Proof ODV-031 (Revised portrait, Thin Date) Philadelphia Denver San Francisco Proof http://varietyvista.com/01a LC Doubled Dies Vol 1/Obverse Design Varieties.htm
Good eye ! 1974 was a year that had an obverse design change with in that year giving us what can be referred to as large and small dates. Neither one carriers a premium over the other. Here is a link that gives a better explanation. http://www.lincolncentforum.com/small-dates-vs-large-dates/
You need to make your thread title understandable I thought you had 1 Cent with 2 dates. You should of said "Does the 1974 Cent have different dates?"