#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>

using namespace std;

typedef long long LL;
const int N = 1e3 + 10;
char a[N], b[N];
int n;

int check()
{
    for(int i = 0; i < n; i ++)
        if(!( (a[i] == 'A' && b[i] == 'U') || (a[i] == 'T' && b[i] == 'A') || (a[i] == 'C' && b[i] == 'G') || (a[i] == 'G' && b[i] == 'C') ))
            return 0;
    return 1;
}

int main()
{
    int T;
    scanf("%d", &T);
    while(T--)
    {
        scanf("%d", &n);
        scanf(" %s %s", a, b);
        puts(check() ? "YES" : "NO");
    }
    return 0;
}