PCB Footprints: SOT-363: SC-88 vs SC-70
Comparing representative documents, it looks like the difference is that SC-88 is allowed to be slightly taller (1.1mm max) than SC-70 (1.0mm max). The PCB land pattern looks like it is the same, or compatible.
SOT-363 alias JEITA SC-88
https://www.nxp.com/docs/en/package-information/SOT363.pdf
pitch e1 = 0.65mm BSC (between successive centers)
distance between rows (center to center) = 1.8mm
recommend pad width 0.4mm x length 0.5mm to 0.6mm
EIAJ SC70-6 pin alias JEDEC MO-203AB
https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-sc-70/SOT_6_05-08-1638.pdf
pitch e = 0.65mm BSC (between successive centers)
distance between rows (center to center) = 1.8mm
recommend pad width 0.47mm max x length 1mm max