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

char A[200],B[200];
int n;
inline bool check()
{
    int i;
    for (i=1;i<=n;i++)
    {
        if (A[i]=='A' && (B[i]!='U')) return false;
        if (A[i]=='T' && (B[i]!='A')) return false;
        if (A[i]=='C' && (B[i]!='G')) return false;
        if (A[i]=='G' && (B[i]!='C')) return false;
    }
    return true;
}

int main()
{
    int T;
    scanf("%d",&T);
    for (int kase=1;kase<=T;kase++)
    {
        scanf("%d",&n);
        scanf("%s",A+1);
        scanf("%s",B+1);
        if (check()) printf("YES\n"); else printf("NO\n");
    }
    return 0;
}