were he to violate the secrecy of confession,

No, i don't think there is no difference, and i can't think why anyone would say "Had he been to . . . " which would be awkward, and arguably, not grammatically correct.

"were he to" means "if he did...."

I believe the tenses are incorrectly matched in the above, and that it should be either:

or

Were he to have violated the secrecy of confession, sacrilege meriting excommunication would have been committed.

By EITHER, do you mean Setanta's and Mctag's answer?

No

My post got mangled. I meant to write:

I believe the tenses are incorrectly matched in the above, and that it should be either:

Were he to violate the secrecy of confession, sacrilege meriting excommunication would be committed

or

Were he to have violated the secrecy of confession, sacrilege meriting excommunication would have been committed.

THank you~