Can you substitute different fresh herbs?

Hey folks, I have a huge amount of lemon verbena this year, and I was thinking about taking a mint jelly recipe like this one and substituting an equal amount of lemon verbena for the mint to make lemon verbena jelly. I've been searching the internet and I can't find anywhere whether you can substitute one kind of fresh herb for another. Can I sub lemon verbena for mint? If I was making pasta sauce and the recipe called for fresh basil, could I add fresh oregano instead?

Also, if it is fine to substitute herbs, I've never made mint jelly before so if you have a tested mint jelly recipe that's better than the NCHFP one, let me know.