#include <cmath>
#include <queue>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#define INF 0x3f3f3f3f
#define LL long long

using namespace std;

char a[111],b[111];
int main()
{
    int t,i,j,m,n;
    scanf("%d",&t);
    while(t--)
    {
        int f=0;
        scanf("%d",&n);
        scanf("%s%s",a,b);
        for(i=0;a[i];i++)
        {
            if(a[i]=='A' && b[i]=='U' || a[i]=='C' && b[i]=='G' || a[i]=='G' && b[i]=='C' || a[i]=='T' && b[i]=='A')
                ;
            else
            {
                f=1;break;
            }
        }
        if(f) cout<<"NO"<<endl;
        else cout<<"YES"<<endl;
    }
    return 0;
}