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@lae
Yep. I don't know what you mean by 'rail' saddle - every saddle uses rails (except those really old sprung ones where the clamp is integrated into the springs). The only difficulty could come if you want to use a modern carbon-railed saddle which have larger diameter rails, but I imagine that all old saddles and the majority of new ones (except those with carbon rails) will fit.
If that doesn't sound right, then post some photos of the existing saddle and clamp.