Can I use a 20-20-20 instead of a 20-10-20

As Dr. Bruce Bugbee suggests, they use a NPK 20-10-20.
Unfortunately I can't easily find it (I've tried online and in some shops), but I found a very good 20-20-20.

May I use a 20-20-20 instead of a 20-10-20?

I don't see why not.. I grew with Rapid Gro 20 20 20 back in the old days...

What is your chosen media?

I started with coco, and determined what fertilizer to use by learning what other coco growers are using. Ie copycat.

Currently using Jacks powder nutes.

My media is Light Mix from Bio Bizz, it is based on Baltic peat.
The plants are autoflowering.