No, it isn't. It's a regular grain leather with what I would call a medium-fine grain structure. The SC shrunken leathers have a much bigger texture pattern to them.
You can see the shrunken leather here in the first picture on the lacing part of the shoes vs the INCA on the pair in the next picture below.
Can you, perhaps, provide a couple more angle of these shoes, so one can gauge the Sailor Last better?