#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<string>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<math.h>
using namespace std;
string s1,s2;
int T=0,N=0;
void solv()
{
    int i=0;
    for(i=0;i<N;i++){
        if(s1[i]=='A'){
                if(s2[i]!='U'){
                     printf("NO\n");
                    return;
                }
         }
        else if(s1[i]=='T'){
                if(s2[i]!='A'){
                     printf("NO\n");
                    return;
                }
         }
        else if(s1[i]=='C'){
                if(s2[i]!='G'){
                     printf("NO\n");
                    return;
                }
         }
          else if(s1[i]=='G'){
                if(s2[i]!='C'){
                     printf("NO\n");
                    return;
                }
        }

    }
    printf("YES\n");
}
int main()
{

    scanf("%d",&T);
    while(T--){
        scanf("%d",&N);
        cin>>s1>>s2;
        solv();
    }
    return 0;
}