14500 and 18650 are just mimimeter dimensions for the the cells- they use the same tech inside. 3.7V nominal, 4.2v fully charged kind of thing.
Afaik a 14500 is 14mm diameter, 500 long (nominally). 18650- is 18×650 etc.
But all these cells have the same tech inside.
14500 are a teensy bit bigger than AA. But mentally /exponentially longer capacity. 18650/14500 can use the same charger.
AA and all that is totally different tech- not even 20th century: so all that duracell AA/AAA/C/D cell stuff is oldie stuff.
If in doubt show us a photo.
#Edit – a couple of quick edits there from me- if in doubt: dont.