Building a DIY projector. LED driver voltage output 24-36V, 100 watt LED voltage 32-38V. The LED driver is short 2 volts, would this matter much?
Buying parts from AliExpress can give you some great bargains but the downside is that the "datasheets" are often very limited in information content and accuracy. That said, for the LED the 32-38V range probably encompasses all 3 of:


part-to-part variation
higher forward voltage at higher operating temperature
gradual increase in forward voltage over lifetime


The actual forward voltage also is an (increasing) function of the forward current, though typically the specified forward voltage will be at a particular fixed current.

If you are not so unlucky as to get the very worst parts from the manufacturer's binning, and if you do a good job of keeping it cool (which is not at all trivial with these high power LEDs), and perhaps if you're willing to accept a small reduction in light output, it will likely work fine.

You say you'd like to power the fans from this supply also. That might be possible but it would really restrict your options in terms of fan selection. It would also mean that you couldn't keep the fan running after shutting down the LEDs, which could mean problems with heat soakback. I'd probably just use fans that run directly on mains voltage.