Put meter into continuity mode, touch one probe to the mettal connector housing (that’s grounded) and touch the other pins with the other probe and note where it beeps, you’ll likely find the ground pins aren’t in the same place as they are on regular lcds.
That’s where they would be on the normal lcd pinout, on the 2k oled panel pin 36 and 37 are panel power and the backlight enable and bist enable pins need 1.8v signal levels instead of the regular 3.3 level so you’ll need a level shifter for those signals. Pin 18-21 is in the middle of the dp signal area on the oled. But I would not recommend trying to mess with an oled panel without the datasheet at this point, they are expensive and have a lot of ways to blow them up.