Yes, the fangs will be in the same location. Once you get all 4 again, you will have to go back to the red heart to turn them into "vitalized dragontooth". You need 8 of them to craft the spear again from the blacksmith.
just wanted to say I found around 10+ at the statue of seven near the dawn winery, not labeled on this guide, in game, or any other guide I saw online. probably more than 9 if you look around a bit more
Plugging in your numbers, it's something like:
(1000(your attack) * (1 + 50%)(element damage bonus)*(500%(skill multiplier))*50%(same level between you and your enemy)*(1 - 10%(enemy resistance)) + 20.000*33%(Zhongli 4th ascension passive)) * 120%(crit damage modifier)
Not entirely sure yet if the 4th ascension passive is before the crit, but the result is roughly around 7425.