How to animation sheets work compared to sprite sheets?

I purchased a few animation sheets from the shop and they run at 30 and 60 FPS compared to the base RPG Maker animations sheets which are, what I believe to be, a default 15 PFS. So when I run it at 60 FPS the default animations go by 4 times faster.

Correct me if I am wrong but I figured by basically tripling or quadrupling each frame of the default animation sheets everything should look fine, I think. So I was wondering how the animation sheets work compared to the sprite sheets which are set to a 3x4 grid. Is there anything I need to know before trying this?

animation sheets and sprite sheets have nothing to do with each other.

animation sheets contain elements to be used in the creation of animations in the animation tab of the database. Each element of the animation sheets is used independently, and its the animation definition that determines order or sequence.

spritesheets have a fixed structure because they're automatically used for stepping or walking animation by events on the map.

That's what I thought but I just wanted to make sure before doing a bunch of work in PS. Thanks.