the rims are the same but the spoke holes are drilled at a different angle on the brake drum side for conicals.
The rims your after are very common, they were also fitted to full width Triumph hubs from the late 50's up to '68 / 70' twin leader fronts, Also '68 / 70' A65's. I may be able to help if you can't find any as I have to lace a couple up soon with new rims. I'll see how good or bad the old ones are in the next few days.
Cheers Steve.