#include<bits/stdc++.h>
using namespace std;

#define int long long
#define endl '\n'
typedef unsigned long long ull;

const int N=1e5;
const int INF=0x3f3f3f3f3f3f3f3f;

void solve()
{
    int n;
    cin >> n;
    vector <int> v(n);
    int ans=0;
    for(int i=0;i<n;++i)
    {
        cin >> v[i];
    }
    for(int i=0;i<n;++i)
    {
        int x;
        cin >> x;
        ans+=(x!=v[i]);
    }
    cout << ans << endl;
}

signed main()
{
    //cout.flags(ios::fixed); cout.precision(8);
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    int T=1;
    cin >> T;
    for(int i=1;i<=T;++i)
    {
        solve();
    }
    return 0;
}
/*

*/