niko spotter eye piece question

[coyotekid]

good morning

I was just wondering if any of you have any idea if different nikon eye pieces are swapable between different nikon scopes such as the fieldscope, prostaff and the earth and sky. I get the general Idea that there is a difference between 60mm an 80 mm objectives. I more wondering if I could use a new 60mm fieldscope eypiece on a few years old prostaff and earth 'n sky?

 

any thoughts would be great.

thanks,

-sam