#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<iomanip>
#include<cmath>
#include<cctype>
#include<ctime>
#include<string>
#include<cstring>
#include<string.h>
#include<sstream>
#include<fstream>
#include<algorithm>
#include<map>
#include<stack>
#include<queue>
#include<list>
#include<set>
#include<vector>
using namespace std;
int main()
{
    int t;
    char a[120],b[120];
    cin>>t;
    while(t--)
    {
        int z;
        cin>>z;
        scanf("%s",a);
        scanf("%s",b);
        int len=strlen(a);
        int flag=1;
        for(int i=0;i<len;i++)
        {

            if(a[i]=='A')
            {
                if(b[i]!='U')
                {
                    flag=0;
                    break;
                }
                else continue ;
            }
            if(a[i]=='C')
            {
                if(b[i]!='G')
                {
                    flag=0;
                    break;
                }
                else continue ;
            }
            if(a[i]=='G')
            {
                if(b[i]!='C')
                {
                    flag=0;
                    break;
                }
                else continue ;
            }
            if(a[i]=='T')
            {
                if(b[i]!='A')
                {
                    flag=0;
                    break;
                }
                else continue ;
            }

        }
        if(flag)cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
            }
            return 0;
}