[Help] WeaponID's topic

So I've found all this manually by buying/switching weapons all the time, toke some time.
But do they change on each update? Or is the numbers different from game to game?
Like is there some array to compare like the ID too, to get the actual name or isn't that neccesary?

Code:

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Deagle = "1"
Dual Barretas = "2"
Five-Seven = "3"
Glock = "4"
AK47 = "7"
AUG = "8"
AWP = "9"
G3SG1 = "11"
Galil = "13"
Magma = "14"
M4A1 = "16"
MAC10 = "17"
P90= "19"
UMP-45 = "24"
XM1014 = "25"
Bizon = "26"
Negev = "28"
Sawed-off = "29"
Tec9 = "30"
USP = "32"
MP7 = "33"
Nova = "35"
CZ75 = "36"
SG 553 = "39"
Scout = "40"
Knife = "42"
Flash = "43"
HEgrenade = "44"
Smoke = "45"
Molotov = "46"
Decoy = "47"
Bomb = "49"

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