Here's the size 54 and size 56 compared (link below). Press "Shadow Bike" to enable a dashed shadow, and "Swap Bikes" to swap between the 54 and 56, and edit saddle height, spacers and stem length as you like.

The 56 can be made a little bit less aggressive. Between 54 and 56 you often get a bit more stack than reach. The seat tube angle is laid back though which should push the saddle further back and add more reach, assuming you have a higher saddle on the larger bike. But as we fit the same person the saddle height is the same and the saddle isn't moved as far back. We still need to push it a little bit forward and there's still a few mm longer reach left on the 56.

Anyway, sizing up is sometimes better than sizing down when you want a more relaxed fit. It depends a bit on how many spacers you can fit under the stem.

https://www.bikegeocalc.com/#22Canno...5F172.5G30H30Z