Placed it in ender-5 with custom firmware. Works perfectly. Judging by the noice level of the motors the drivers are TMC indeed, based on the package size (DIP) they are TMC2225. These are technically identical to 2208 and they are most likely in stand alone mode. Connecting my BL Touch, however, was not without issue. My BL is from a Creality kit and has a Dupont connector that is too loose in the JST socket, so I created an adapter for it.
Good upgrade - Stepper motors are almost dead silent now. However, I am not noticing any improvements to print quality.