I think there are around 21 changes with a few guess.
1) Name: PuristSPro All-Black Rescue.
2) Limited edition: 178 pieces
3) Case: "PuristSPro" etched into left side of case instead of “Disinfectable”.
4) Case: Change in orientation for the “Pulsations” numberings from horizontal to vertical.
5) Case: Change to the “Respirations” makers, the “dash” symbol changed to right side.
6) Caseback: Engraved limited edition serial number.
7) Crown: All PVD instead of white background for the St. Gallen cross.
8) Strap: Additional PuristSPro red silicone strap.
9) Buckle: "Disinfectable" wording replaced with "PuristSPro".
10) Dial: "St Gallen" removed.
11) Dial: "Automatic 10ATM/330ft" removed
12) Dial: "Rescue" removed and replaced with "PuristSPro".
13) Dial: 24 hours number markers removed.
14) Dial: Change of color from red to black for the "5 Respirations" and "15 Pulsations" wordings.
15) Dial: Change of color for the minutes markers at 9 to 11 o’clock from yellow to green.
16) Date Window: White frame around the window removed.
17) Second hand: One of hands completely red instead of just the arrow tip.
18) Hour and Minute hand: Stainless steel instead of painted white.
19) Hour hand: Longer hour hand
20) Minute hand: Longer minutes hand
21) Movement: PuristSPro engraved on rotor.
Kim