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General
 
 
# Author Problem Lang Verdict Time Memory Sent Judged  
195955565 Practice:
MartinXu6 		1800E2 - 31 PyPy 3-64 Accepted 951 ms 21744 KB 2023-03-04 14:06:42 2023-03-04 14:06:42
→ Source 
for _ in range(int(input())):
  n, k = map(int, input().split())
  s1 = input()
  s2 = input()
  if n <= k: print("YES" if s1 == s2 else "NO")
  else:
    reg = n - k
    print("YES" if (sorted(s1) == sorted(s2) and s1[reg:-reg] == s2[reg:-reg]) else "NO")
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