They are extremely different. For starters, Quality Service refers to services, while UX refers to services, products, systems, living experiences and so on.
But more important than that: User Experience is a vast environment with tons of disciplines, including psychology, computer science, design, architecture, statistics and so on. It also includes CX (customer Experience)
On the other hand, Service Quality is just a process belonging to CX. As a matter of fact, it can be reduced to an equation (from the same Wikipedia definition you mention):
SQ = Service Quality,
P=Perceived Performance and
E= Perceived Expectations
Of course, UX can't be reduced to a single equation, because it's a complex net of interlinked disciplines.
As an example: you can measure Service Quality using the SERVQUAL method, as you correctly mention. Now, think about this: which of the many steps, processes, instances, paradigms and business scenarios are you going to measure in UX? Just to mention a few: user research, prototype, CX, usability, accessibility, marketing, statistical analysis, information architecture.... as you can see, it's absolutely impossible to measure all of it. You can measure PARTS of the UX process (for example, customer satisfaction would be quite similar to Quality Service and as a matter of fact, it's very common to use SERVQUAL as methodology), but you can't measure UX as a whole