Quality of images posted on Instagram via the planner

Hello, I make a lot of soft and pastel visuals, but when I post them directly on Instagram, I notice that my visuals lose quality (maybe it's due to the compression of the social network). This is why I systematically retouch contrast and saturation with Instagram's internal settings before posting on the social network.

I've noticed that when I program posts on the planner, they post directly to Instagram without being able to retouch the colors.

My question is simple: does going through the planner result in the same degradation in quality as when posting directly to instagram, or does the posted rendering remain faithful to the original?