Here are the two SNPs that the Big Y shows as being different between me and Merrick:
According to the Big Tree website:
CTS3563 is 15022900-G-A
That shows up as a unique mutation for Merrick. So I wouldn't think that if Merrick has this as a unique mutation that that would count as a one SNP difference. I don't know much about CTS11841. Apparently I have that one and Merrick doesn't. I have also read that it is unreliable, so I'm not sure why this would be listed as a difference between me and anyone.