They are the same! Its the Reditch scale if I'm not mistaken. One solution to not being able to tie the flies on at the river is to tie them onto a length of tippet at home and tie a loop to the other end. Then you can just loop to loop them onto the leader when you need them.

The smallest of flies are tied on Mustad size 32 hooks, unfortunately no longer available, They are a bit on the small side! It is possible to tie flies on them though.

Cheers,
A.