not to hijack another thread

I have this set, ok several, of Campy Record hubs laced to GP4 rims. Not muuch use to mmeeee. So does anyone know of a (hopefully Mavic) rim that will replace these using the same spokes. I know, cheapazz. Looks like MA40's are really close but I don't have any way to tell short of breaking down two wheels to lace one.
thanks
Charlie

OK - - I Screwed UP. I neglected to mention that the replacement, like MA40s, would be a clincher

sorry - - my bad