Agreed; you have one of each. Now you just need a Small Date P and a Large Date D to fill those holes in your album -LTB
Label them so you can compare other coins you find to them. The 1960P small date looks the same as the 1960D. Notice the 6, it's easy to see.
I had a hard time with spotting small dates but after finding my first I can spot them with out any magnification.
Go to www.lincolncentresource.com and www.coppercoins.com they have examples of different varities of coins and how you can tell the difference between one.