#include<iostream>
#include<string>
#include<cstring>
#include<cstdio>
#include<algorithm>

#define LL long long
#define inf 0x3f3f3f3f
#define eps 1e-6

using namespace std;
const int maxn = 1000000+10;

char s[maxn],t[maxn];
int main()
{
    int T,n;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%d",&n);
        scanf("%s%s",s,t);
        bool flag=1;
        for (int i=0;i<n;i++)
        {
            if (s[i]=='A' && t[i]!='U') flag=0;
            if (s[i]=='T' && t[i]!='A') flag=0;
            if (s[i]=='C' && t[i]!='G') flag=0;
            if (s[i]=='G' && t[i]!='C') flag=0;
        }
        if (flag) printf("YES\n");
        else printf("NO\n");
    }
    return 0;
}