In the world of fasteners, T20 and TX20 are generally different names for the same size of the standard Torx drive system. They both refer to a 6-pointed star-shaped bit with a point-to-point distance of approximately 3.86mm (0.156 inches).
Product Listings: Retailers like Amazon or specialty tool shops often list them as "T20 TX20" to ensure they appear in all customer searches. difference between t20 and tx20
Torx Plus: The High-Tech Screw Hiding in Our Gadgets - iFixit In the world of fasteners, T20 and TX20