1722_B_ColourBlindness.py

def solve():
	_ = int(input())
	a = input()
	b = input()
	
	c = b.replace('B','G')
	d = a.replace('B','G')
	
	if c == d:
		print("yes")
	else:
		print("no")	
	
	
	
 
						
				
	
 
 
 
t = int(input())
while t != 0:
	solve()
	t -= 1