/* ***********************************************
Author        :kuangbin
Created Time  :2015/12/5 18:55:26
File Name     :F:\ACM\2015ACM\BestCoder\BC65\A.cpp
************************************************ */

#include <stdio.h>
#include <string.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <time.h>
using namespace std;
char str1[110],str2[110];

int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    int T;
    int n;
    scanf("%d",&T);
    while(T--) {
        scanf("%d",&n);
        scanf("%s%s",str1,str2);
        bool flag = true;
        for(int i = 0;i < n;i++) {
            if(str1[i] == 'A' && str2[i] == 'U')continue;
            if(str1[i] == 'T' && str2[i] == 'A')continue;
            if(str1[i] == 'C' && str2[i] == 'G')continue;
            if(str1[i] == 'G' && str2[i] == 'C')continue;
            flag = false;
        }
        if(flag)puts("YES");
        else puts("NO");
    }
    return 0;
}