They are indeed the same thing! In Irish folklore, calling the Folk by their true name(s) could draw them to you, or worse, be seen as a sign of disrespect. My great aunts/uncles and great grandmother were Irish immigrants, so really, I’m just keeping with tradition and respecting the Good Gentlemen of the Hills!
In terms of resources:
Wikipedia has a list of beings referred to as fairies.
Here’s Legends and Lore From Europe.
Here’s the A-Z Dictionary of Fairies and the Wee Folk.
Here’s a guide to Celtic folklore.
Listverse also has some great articles on fairies here and here.
It’s also worth noting that in some mythologies, the word “fairy” is also considered disrespectful/a general no-no.
I hope this helps, and happy writing! ❤