Scott 613 day

Below are six perf 11 stamps.
The upper three have clear ink on the back. Out of the three, the first to the left has a vertical guideline, as well, on the left side.
The pair presents one spot on the back, which on digital microscope seems to be a very dark violet, like a marker or pen mark. It also has a guideline, as well, at the top.
The one at the bottom has no such ink.
None of the six stamps goes above 22mm in height.
Unfortunately, I don't have with me a rotary perf 10 to make a template. So, how can I make the difference between them, please?
Because on these stamps the difference between flat plate and rotary press is only 0,25 mm I wonder if paper shrinkage can cause a 610 and a 613 to have the very same dimensions? [I believe I read somewhere that rotary printed paper tends to shrink more than flat press, because of being forced to dry ...]

