No, those synthetics are analytical too, in the end, they simply incorporate concepts that can only be understood with analysis of adjacent tectonics.
Synthetic a prioris seem more to me to be about guessing, making something up that later turns out to be true. This is the basis for Nietzschean understanding of will to power.
"Light moves at the speed of light." analytical
"Light will shine, and at this speed." synthetic a priori