Item=key=aanumber=3key=bbnumber=5key=aaanumber=51key=csnumber=13key=a1anumber=77key=addnumber=31 local tab=key=aaanumber=33key=bbnumber=5key=aaanumber=51key=csnumber=13key=a1anumber=77key=addnumber=31

local item = { {key = "aa", number = 3}, {key = "bb", number = 5}, {key = "aaa", number = 51}, {key = "cs", number = 13}, {key = "a1a", number = 77}, {key = "add", number = 31} }

local tab = { {key = "aaa", number = 33}, {key = "bb", number = 5}, {key = "aaa", number = 51}, {key = "cs", number = 13}, {key = "a1a", number = 77}, {key = "add", number = 31} }

for _, tabItem in ipairs(tab) do for _, item in ipairs(item) do if item.key == tabItem.key then item.number = item.number + tabItem.number break end end end