Can I use the same press dies for different snap sizes and types?
In general, you cannot use the same press dies for different sizes or types of snaps. If you have size 20 dies for plastic snaps, you can only attach size 20 plastic snaps and will need different dies to attach metal snaps or other sizes. The exception is that sizes 14 and 16 plastic snaps have identical studs and identical sockets so you can use the same stud and socket dies for both sizes (but will need different cap dies).