The phrase "a discernible difference to" is correct and usable in written English.
It can be used when discussing noticeable distinctions or changes in relation to something else.
Example: "There is a discernible difference to the quality of the product after the recent improvements were made."
Alternatives: "a noticeable difference in" or "a clear distinction from".
The addition of an authentic all-rounder has made a discernible difference to the tourists.
Aside from the occasional eclectic discovery, are there areas where amateurs can make a discernible difference to the general body of scientific knowledge?
My problem with this is that, while I don't think it makes a discernible difference to the finished meringues, it does mean you have to make them before the custard, even though that takes far longer to cool down, and with a dessert this sweet, you really do want it cold, rather than just cool.
The plan has made a discernible difference to Ridgeview Medical Center, a hospital chain in Minneapolis with 1,400 employees.
He also paid tribute to Washington's financial commitment, saying US efforts to rebuild the country's infrastructure and bring schooling to three million girls had made a discernible difference to the lives of the Afghan people.
There's definitely a discernible difference to pursuing an Arduino-based RepRap piecemeal approach to 3D printing rather than building some 'some-assembly-required' kind of kit such as an Ultimaker, Up!, or Makerbot.
I am upset that I have spent 27 years of my life having made no discernible difference to the world around me". HE WAS NOT a saint.
The only discernible difference to me in switching over to gas-powered electricity as a driver was an extremely low-level purr from the generator.
The operation has made no discernible difference to his size.
It made no discernible difference to its sale.
But it is less sensitive to heat, with temperature making no discernible difference to the body clock.
