#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <queue>
using namespace std;

const int maxn = 100005;


int main()
{
    int t;
    string str1,str2;
    int n;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d",&n);
        cin>>str1>>str2;
        int ans = 1 ;
        for(int i = 0 ; i < n ; i++)
        {
            if((str1[i]=='A'&&str2[i]=='U')||(str1[i]=='T'&&str2[i]=='A')
               ||(str1[i]=='C'&&str2[i]=='G')||(str1[i]=='G'&&str2[i]=='C')){}
            else {ans = 0 ; break;}
        }
        if(ans==0)cout<<"NO"<<endl;
        else cout<<"YES"<<endl;
    }
    return 0;
}