I would not worry about it one bit, ive two cars that are so close the last of the vin is seperated by 4, might of been in sight of each other on the assembly line if thats how it worked, but both trunk vins are 1 off on the start of the sequential.

So if thats confusing one car would be xxxxxxxxxxxx2
The other xxxxxxxxxxxx6 all same except last

Trunk on both xxxxxxxyxxxx2
xxxxxxxyxxxx6

So both are one number off on the 100000 just like the op posted.

Funny thing is it was simple luck I got two of the same cars 4 apart, one org. came from NJ, the other from FL.

I wrote this and its hard to understand.