#include<cstdio>
#include<iostream>
#include<queue>
#include<map>
#include<stack>
#include<cstring>
#include<string>
#include<cmath>
#include<algorithm>
using namespace std;
int main()
{
   int T=0;
   scanf("%d",&T);
   while(T--)
   {
       int n=0;
       bool mark=0;
       scanf("%d",&n);
       getchar();
       char a[103],b[103];
       scanf("%s",a);
       getchar();
       scanf("%s",b);
       getchar();
       for(int i=0;i<n;i++)
       {
           if(a[i]=='A'&&b[i]=='U')
           {
               continue;
        }
        if(a[i]=='T'&&b[i]=='A')
        {
            continue;
        }
        if(a[i]=='G'&&b[i]=='C')
        {
            continue;
        }
        if(a[i]=='C'&&b[i]=='G')
        {
            continue;
        }
        mark=1;
        break;
    }
    if(mark)
    {
        printf("NO\n");
    }
    else
     printf("YES\n");
   }
    return 0;
}