Some versions of some resins can be mixed, some can’t. See This Topic for a compatibility listing.
If you are in the situation where the new version can be mixed with the older version you have, you can simply toss the old cartridge when it’s empty and replace it with the new one. Upon starting a new print, the printer will display a warning stating that the two resins (tank and cartridge) are not the same, you can override hat warning and the tank will now be registered with the new version, even though you still have some old resin in it.
If the two versions can’t be mixed, you can print small stuff until there isn’t enough resin in the tank for the print to succeed, and then you have no choice but to toss the rest of the old resin. From then on you can either clean the tank by hand and use it with the new resin (same thing as before, you will have a warning that you can override), or you can toss the tank and replace it with a new one.