You can see in the above image the only difference is the position of the hydroxyl group (OH) on the carbon chain. They are mirror images of the other but they do not overlap. L-Glucose has to be made in a lab, whereas D-Glucose is naturally occurring. I've written an answer to the following question that might give you some more insight to the pathways involved.
What is the different between NAS & SAE.
Between what?
The different between sag and surges
There is nothing different between them in a real time.
different between sri lanka and cuba
different between organic growth and acquisition
Yes, you can battle between different versions of Pokemon.
Differ is a verb and different is an adjective.
they have different names
what are the different between online and offline Data Processing
Setting disputes between people in different states ~APEX~
= What is the different between permanent magnetic alternator and alternator? =