The idea of this sounds a bit ludicrous to me. Mathematically, how equipment stats are included into our attacks is a very simple equation.
All equipment has ever been has been raw stats. Aka our "Cs" multiplied by 50.
Both charms and rewards are added in with your equipment stats. Which can be found at

In the event of hitting another player,
Our raw build stats(visible at the top of your own profile)

Are multiplied by any Percentage equip/Achievements/Clan Achievements/Perm Items that the player might own.

So for me.
A:
497,015,625 •.34=173,955,469
AD:
666,561,168•.2925=194,969,141
SA:
16,438,713,000•.345=5,671,355,985
SD:
17,664,409,113•.2925=5,166,839,665
*please note that these numbers change based off your troop and spies(except defense from towers)
Then you simple add all the numbers
Build BFA Percent
BFE/CharmsTo show a demonstration here is my BFA:
A:304,358,508
AD:263,882,592
SA:94,318,860
SD:98,258,812

So...
A=
497,015,625 304,358,508 173,955,469
2,888,058,358=
3,863,387,960AD=
666,561,168 263,882,592 194,969,141
1,906,805,187=
3,032,218,088SA=
16,438,713,000 94,318,860 5,671,355,985
3,551,098,311=
25,755,486,156SD=
17,664,409,113 98,258,812 2,018,791,610
5,166,839,665=
24,948,299,200To turn that into a smaller number you are far more used to working with, the equivalence to a CS multiply it by .02
A=3,863,387,960•.02=77,267,759
AD=3,032,218,088•.02=60,644,361
SA=25,755,486,156•.02=515,109,723
SD=24,948,299,200•.02=498,965,984
That is my true damage, and yes, I did take the long way to calculate it. Basically what I'm trying to say is that devs already added charms and rewards into the equipment/Achievement section of your profile.
These numbers in your profile are most likely the result of an echo command utilizing PHP to disclose the variables that are added into this equation.
Essentially, both Charms and Rewards are added to the same number in this equation, so they must be intended to have equal value to equipment.
I'd also like to note the impact that Percent items had on my stats were extremely heavy and I'm only 700m cs. Most of the issues people are encountering could easily be explained by the Percent items the opponent owns, along with the difference in your Percent when hitting them.
A difference of even 5% in bonus items on a BC could be equal to 10b charms.
I hope this helps your understanding of how charms and rewards are calculated.
Have a nice day:)
