And I thought SOT-23-6 was small.
I put both packages in a screenshot together with a"Gauge_10mm_Type2_SilkScreenTop"
I have hand soldered SOT-23-6 by hand for repair work and these are already so small it becomes difficult to do reliably without magnification (and plenty of flux). Because of this you will appreciate any help you get from fitting footprints on the PCB, and putting these footprints on top of each other will probably cost you more in frustration and rework, than it saves to respin the boards.
PCB’s are cheap, also in low quantities. If you want to try it, I recommend to design a test PCB with a few different ways to combine these packages.
You will probably have the most chance of success if you only use the small package Footprint and widen pads 1, 3, 4 and 6 on the outside.
Pads 2 and 5 of the pads from the SOT-363 should not be narrower than the physical pins of the SOT-23 though, because that would eat into the soldering clearance and increase risk of solder bridges.
I had a look at it in the 3D viewer, and pins of the SOT-23 are wider than the pads of the SOT-363. This would combining the footprints on top of each other a job I would not want to solder.