As always... spells taken directly from the database are more accurate and up to date than that of a Wiki, the one you listed is an older version.
Priests get a 10% base + 5% spell power modifier in Holy.
Druids get a 10% base modifier from Resto, and an additional 20% with a HoT on the target.
Resulting in us being roughly 5% below on targets without a HoT, and 15% above on targets with one (not in Beta so unable to confirm exact numbers).
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Flash Heal is affected by Empowered Healing. While the spellpower changes preclude knowing precisely how this will end up working, Flash Heal will almost certainly scale better than Nourish.
Improved Holy Concentration gives an effective +24% haste to Flash Heal.
Flash Heal also receives +15% healing and +10% critical on targets below 50%.
I think it's safe to say that with equivalent gear, Flash Heal will definitely outperform Nourish even under optimal circumstances for Nourish in all respects other than mana consumption (which is too complex for me to really model effectively).
Flash Heal is also more versatile in that you don't have to pre-position HoT spells to make it work well. I think the goal with Nourish is not really to create a Druid version of Flash Heal, but to bridge the gulf in single target throughput between Resto Druids and other healers.