Replacing an LED power supply - but originally there were 2 supplies connected parallel
Seems like the drivers are constant-current-output drivers, but make sure they are so.

It's perfectly fine to connect those drivers in parallel: Each one regulates its output, and has a series diode to prevent any false current to flow through the other.

The intention of connecting the constant-current LED drivers in parallel is to reach the required output power. If the LED load is, say, 40W (e.g. 65V x 0.6A) and you have only 25W drivers with the same output current, then you can parallel them. Their output current may differ (e.g. one has 300mA yet the other has 295mA) but the total current (the sum of the two) will flow through the LED load. That's what you expect.

PS: Some users turn on the driver first unloaded, then plug the LED load in. Don't do that. Because, if the driver operates unloaded then its output voltage can reach to the maximum value allowed (e.g. 120VDC for yours). This high voltage may harm your LED load when you plug it in. So, connect the LED load to the driver then turn the driver on.