#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(x) (x).begin(), (x).end()
#define f(i, n) for (int i = 0; i < n; i++)
#define trace(x) cerr << #x << ": " << x << '\n'
int n;
string s, t;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int tt;
    cin >> tt;
    while (tt--)
    {
        cin >> n >> s >> t;
        if (s == t)
        {
            cout << "YES\n";
            continue;
        }
        if (count(all(t), '1') - count(all(s), '1') ==0 or count(all(t), '1') - count(all(s), '1') == 1)
        {
            cout << "YES\n";
            continue;
        }else
        {
            cout << "NO\n";
        }
    }

    return 0;
}