I found an image of another BTG example on a banknote error site (same 4th and 7th digits matched with solid rectangle at end of the left serial number).
Here is a quick tally of the three 2007 $10 5-digit mismatched serial number notes with BTG prefix that I have found through online research:
BTG 6468334▮ / BTG 5288984 VF (?)
BTG 7508445▮ / BTG 5288995 VF (?)
BTG 9728330▮ / BTG 5368850 VF (?)
Strange fact (coincidence) is that the 4th matched digit on all six $10 (FDT/BTG) mismatched serial number notes is the number "8".
"The answer is out there, Neo. It's looking for you, and it will find you if you want it to." (Matrix)
Logged
Arthur Richards
Contributor, Charlton Catalogue of Canadian Government Paper Money, 19th, 20th, 21st, 22nd and 29th Edition
Pricing Panel Member, Charlton Catalogue of Canadian Government Paper Money, 21st Edition 2009