Maybe the best option is to look at the PCGS coinfacts listing for the 1974
DDO. Just based on the format of your inquiry, my answer is no. If you are unable to detect any visual differences between your coins, then you have either all normal strikes or all doubled die obverses. Because the first option is far more probable, I'll have to default to that one.
Yes, you can post fifteen different coins and receive opinions on them, but you'll learn less than if you looked for the markers and took a closer look yourself first.